Delphi 默认字体大小不会对我们不利 Drawable.Font.Size:=10+随机（4）*4； Drawable.TagFloat:=Drawable.Font.Size；如果Text.Length ItemAppearanceObjects.ItemEditObjects.ObjectsCollection=< 项目 AppearanceObjectName='Text1' AppearanceClassName='TTextObjectAppearance' 结束> 结束对象工具栏1:t工具栏 Padding.Top=4.000000000000000000000000 Padding.Bottom=4.000000000000000000000000 大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False TabOrder=1 对象标签1:TLabel 对齐=内容大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False StyleLookup='toollabel' TextSettings.HorzAlign=Center Text='可变行高演示' 结束对象按钮1:t按钮对齐=右页边距。右侧=5.000000000000000000000000 位置X=448.000000000000000000000000000000 位置Y=4.000000000000000000000000 大小.宽度=57.000000000000000000 大小.高度=36.000000000000000000000000 Size.PlatformDefault=False StyleLookup='listitembutton' TabOrder=1 Text='填充列表' OnClick=按钮1单击结束结束结束你的循环中只有一个输入错误。@Olivier，你能说得具体点吗。我检查了它哪一个是打字错误？在Items数组中使用I代替1。 unit MainForm; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, System.Generics.Collections, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Controls.Presentation, FMX.StdCtrls, FMX.ListView.Types, FMX.ListView.Appearances, FMX.ListView.Adapters.Base, FMX.ListView, Markov; type TVariableHeight = class(TForm) Button1: TButton; ListView1: TListView; ToolBar1: TToolBar; Label1: TLabel; procedure Button1Click(Sender: TObject); procedure ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); private FChain: TChain; FBitmaps: TDictionary<Integer, TBitmap>; FText: TArray<string>; procedure ReadText; function GetDimensionBitmap(const Width, Height: Single): TBitmap; public function GetTextHeight(const D: TListItemText; const Width: Single; const Text: string): Integer; destructor Destroy; override; end; var VariableHeight: TVariableHeight; implementation uses System.IOUtils, FMX.TextLayout; {$R *.fmx} // Create a new item with random text of random length procedure TVariableHeight.Button1Click(Sender: TObject); begin ReadText; ListView1.Items.Add.Data['txtMain'] := FText[Random(Length(FText))]; // with classic appearances, use Text property //ListView1.Items.Add.Text := FChain.Generate(Random(100) + 5); end; function TVariableHeight.GetDimensionBitmap(const Width, Height: Single): TBitmap; procedure Arrow(C: TCanvas; P: array of TPointF); begin C.DrawLine(P[0], P[1], 1.0); C.DrawLine(P[0], P[2], 1.0); C.DrawLine(P[0], P[3], 1.0); end; var EndP1, EndP2: TPointF; TextBitmap: TBitmap; IntHeight: Integer; begin IntHeight := Trunc(Height); if FBitmaps = nil then FBitmaps := TDictionary<Integer, TBitmap>.Create; if not FBitmaps.TryGetValue(IntHeight, Result) then begin Result := TBitmap.Create(Trunc(Width), IntHeight); FBitmaps.Add(IntHeight, Result); if Result.Canvas.BeginScene then begin Result.Canvas.Clear(TAlphaColorRec.Null); Result.Canvas.Stroke.Color := TAlphaColorRec.Darkgray; // Draw the arrows EndP1 := TPointF.Create(Width/2, 0); EndP2 := TPointF.Create(Width/2, Height); Arrow(Result.Canvas, [EndP1, TPointF.Create(Width/2, Height/2 - Width/2), EndP1 + TPointF.Create(-2, 5), EndP1 + TPointF.Create(2, 5)]); Arrow(Result.Canvas, [EndP2, TPointF.Create(Width/2, Height/2 + Width/2), EndP2 + TPointF.Create(-2, -5), EndP2 + TPointF.Create(2, -5)]); // Draw the dimension text TextBitmap := TBitmap.Create(Trunc(Width), Trunc(Width)); try if TextBitmap.Canvas.BeginScene then with TextBitmap.Canvas do begin Clear(TAlphaColorRec.Null); Fill.Color := TAlphaColorRec.Darkgray; FillText(TextBitmap.BoundsF, ''.Format('%d', [IntHeight]), False, 1, [], TTextAlign.Center, TTextAlign.Center); EndScene; end; TextBitmap.Rotate(90); Result.Canvas.DrawBitmap(TextBitmap, TextBitmap.BoundsF, TextBitmap.BoundsF.CenterAt(Result.BoundsF), 1); finally TextBitmap.Free; end; Result.Canvas.EndScene; end; end; end; destructor TVariableHeight.Destroy; var Key: Integer; begin FChain.Free; if FBitmaps <> nil then for Key in FBitmaps.Keys do FBitmaps[Key].Free; FBitmaps.Free; inherited; end; // Calculate height for text drawable D function TVariableHeight.GetTextHeight(const D: TListItemText; const Width: single; const Text: string): Integer; var Layout: TTextLayout; begin // Create a TTextLayout to measure text dimensions Layout := TTextLayoutManager.DefaultTextLayout.Create; try Layout.BeginUpdate; try // Initialize layout parameters with those of the drawable Layout.Font.Assign(D.Font); Layout.VerticalAlign := D.TextVertAlign; Layout.HorizontalAlign := D.TextAlign; Layout.WordWrap := D.WordWrap; Layout.Trimming := D.Trimming; Layout.MaxSize := TPointF.Create(Width, TTextLayout.MaxLayoutSize.Y); Layout.Text := Text; finally Layout.EndUpdate; end; // Get layout height Result := Round(Layout.Height); // Add one em to the height Layout.Text := 'm'; Result := Result + Round(Layout.Height); finally Layout.Free; end; end; procedure TVariableHeight.ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); var Drawable: TListItemText; SizeImg: TListItemImage; Text: string; AvailableWidth: Single; begin SizeImg := TListItemImage(AItem.View.FindDrawable('imgSize')); AvailableWidth := TListView(Sender).Width - TListView(Sender).ItemSpaces.Left - TListView(Sender).ItemSpaces.Right - SizeImg.Width; ShowMessage(TListView(Sender).Height.ToString); // Find the text drawable which is used to calcualte item size. // For dynamic appearance, use item name. // For classic appearances use TListViewItem.TObjectNames.Text // Drawable := TListItemText(AItem.View.FindDrawable(TListViewItem.TObjectNames.Text)); Drawable := TListItemText(AItem.View.FindDrawable('txtMain')); Text := Drawable.Text; // Randomize the font when updating for the first time if Drawable.TagFloat = 0 then begin Drawable.Font.Size := 1; // Ensure that default font sizes do not play against us Drawable.Font.Size := 10 + Random(4) * 4; Drawable.TagFloat := Drawable.Font.Size; if Text.Length < 100 then Drawable.Font.Style := [TFontStyle.fsBold]; end; // Calculate item height based on text in the drawable AItem.Height := GetTextHeight(Drawable, AvailableWidth, Text); Drawable.Height := AItem.Height; Drawable.Width := AvailableWidth; SizeImg.OwnsBitmap := False; SizeImg.Bitmap := GetDimensionBitmap(SizeImg.Width, AItem.Height); end; procedure TVariableHeight.ReadText; const Delimiters: array of char = [#10, #13]; var Reader: TStreamReader; Stream: TResourceStream; begin if Length(FText) = 0 then begin Stream := TResourceStream.Create(HInstance, 'Blabla', RT_RCDATA); Reader := TStreamReader.Create(Stream); try FText := Reader.ReadToEnd.Split(Delimiters, TStringSplitOptions.ExcludeEmpty) finally Reader.Close; Reader.Free; Stream.Free; end; end; end; end. object VariableHeight: TVariableHeight Left = 0 Top = 0 Caption = 'VariableHeight' ClientHeight = 480 ClientWidth = 510 FormFactor.Width = 320 FormFactor.Height = 480 FormFactor.Devices = [Desktop] DesignerMasterStyle = 0 object ListView1: TListView ItemAppearanceClassName = 'TDynamicAppearance' ItemEditAppearanceClassName = 'TDynamicAppearance' HeaderAppearanceClassName = 'TListHeaderObjects' FooterAppearanceClassName = 'TListHeaderObjects' OnUpdateObjects = ListView1UpdateObjects Align = Client Size.Width = 510.000000000000000000 Size.Height = 436.000000000000000000 Size.PlatformDefault = False TabOrder = 0 ItemAppearanceObjects.ItemObjects.ObjectsCollection = < item AppearanceObjectName = 'txtMain' AppearanceClassName = 'TTextObjectAppearance' Appearance.TextAlign = Leading Appearance.WordWrap = True Appearance.Height = 44.000000000000000000 Appearance.VertAlign = Center end item AppearanceObjectName = 'imgSize' AppearanceClassName = 'TImageObjectAppearance' Appearance.ScalingMode = Original Appearance.Width = 30.000000000000000000 Appearance.Align = Trailing end> ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = < item AppearanceObjectName = 'Text1' AppearanceClassName = 'TTextObjectAppearance' end> end object ToolBar1: TToolBar Padding.Top = 4.000000000000000000 Padding.Bottom = 4.000000000000000000 Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False TabOrder = 1 object Label1: TLabel Align = Contents Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False StyleLookup = 'toollabel' TextSettings.HorzAlign = Center Text = 'Variable Row Height Demo' end object Button1: TButton Align = Right Margins.Right = 5.000000000000000000 Position.X = 448.000000000000000000 Position.Y = 4.000000000000000000 Size.Width = 57.000000000000000000 Size.Height = 36.000000000000000000 Size.PlatformDefault = False StyleLookup = 'listitembutton' TabOrder = 1 Text = 'Fill List' OnClick = Button1Click end end end_Delphi_Firemonkey_Tlistview

delphi/
Delphi 默认字体大小不会对我们不利 Drawable.Font.Size:=10+随机（4）*4； Drawable.TagFloat:=Drawable.Font.Size；如果Text.Length ItemAppearanceObjects.ItemEditObjects.ObjectsCollection=< 项目 AppearanceObjectName='Text1' AppearanceClassName='TTextObjectAppearance' 结束> 结束对象工具栏1:t工具栏 Padding.Top=4.000000000000000000000000 Padding.Bottom=4.000000000000000000000000 大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False TabOrder=1 对象标签1:TLabel 对齐=内容大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False StyleLookup='toollabel' TextSettings.HorzAlign=Center Text='可变行高演示' 结束对象按钮1:t按钮对齐=右页边距。右侧=5.000000000000000000000000 位置X=448.000000000000000000000000000000 位置Y=4.000000000000000000000000 大小.宽度=57.000000000000000000 大小.高度=36.000000000000000000000000 Size.PlatformDefault=False StyleLookup='listitembutton' TabOrder=1 Text='填充列表' OnClick=按钮1单击结束结束结束你的循环中只有一个输入错误。@Olivier，你能说得具体点吗。我检查了它哪一个是打字错误？在Items数组中使用I代替1。 unit MainForm; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, System.Generics.Collections, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Controls.Presentation, FMX.StdCtrls, FMX.ListView.Types, FMX.ListView.Appearances, FMX.ListView.Adapters.Base, FMX.ListView, Markov; type TVariableHeight = class(TForm) Button1: TButton; ListView1: TListView; ToolBar1: TToolBar; Label1: TLabel; procedure Button1Click(Sender: TObject); procedure ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); private FChain: TChain; FBitmaps: TDictionary<Integer, TBitmap>; FText: TArray<string>; procedure ReadText; function GetDimensionBitmap(const Width, Height: Single): TBitmap; public function GetTextHeight(const D: TListItemText; const Width: Single; const Text: string): Integer; destructor Destroy; override; end; var VariableHeight: TVariableHeight; implementation uses System.IOUtils, FMX.TextLayout; {$R *.fmx} // Create a new item with random text of random length procedure TVariableHeight.Button1Click(Sender: TObject); begin ReadText; ListView1.Items.Add.Data['txtMain'] := FText[Random(Length(FText))]; // with classic appearances, use Text property //ListView1.Items.Add.Text := FChain.Generate(Random(100) + 5); end; function TVariableHeight.GetDimensionBitmap(const Width, Height: Single): TBitmap; procedure Arrow(C: TCanvas; P: array of TPointF); begin C.DrawLine(P[0], P[1], 1.0); C.DrawLine(P[0], P[2], 1.0); C.DrawLine(P[0], P[3], 1.0); end; var EndP1, EndP2: TPointF; TextBitmap: TBitmap; IntHeight: Integer; begin IntHeight := Trunc(Height); if FBitmaps = nil then FBitmaps := TDictionary<Integer, TBitmap>.Create; if not FBitmaps.TryGetValue(IntHeight, Result) then begin Result := TBitmap.Create(Trunc(Width), IntHeight); FBitmaps.Add(IntHeight, Result); if Result.Canvas.BeginScene then begin Result.Canvas.Clear(TAlphaColorRec.Null); Result.Canvas.Stroke.Color := TAlphaColorRec.Darkgray; // Draw the arrows EndP1 := TPointF.Create(Width/2, 0); EndP2 := TPointF.Create(Width/2, Height); Arrow(Result.Canvas, [EndP1, TPointF.Create(Width/2, Height/2 - Width/2), EndP1 + TPointF.Create(-2, 5), EndP1 + TPointF.Create(2, 5)]); Arrow(Result.Canvas, [EndP2, TPointF.Create(Width/2, Height/2 + Width/2), EndP2 + TPointF.Create(-2, -5), EndP2 + TPointF.Create(2, -5)]); // Draw the dimension text TextBitmap := TBitmap.Create(Trunc(Width), Trunc(Width)); try if TextBitmap.Canvas.BeginScene then with TextBitmap.Canvas do begin Clear(TAlphaColorRec.Null); Fill.Color := TAlphaColorRec.Darkgray; FillText(TextBitmap.BoundsF, ''.Format('%d', [IntHeight]), False, 1, [], TTextAlign.Center, TTextAlign.Center); EndScene; end; TextBitmap.Rotate(90); Result.Canvas.DrawBitmap(TextBitmap, TextBitmap.BoundsF, TextBitmap.BoundsF.CenterAt(Result.BoundsF), 1); finally TextBitmap.Free; end; Result.Canvas.EndScene; end; end; end; destructor TVariableHeight.Destroy; var Key: Integer; begin FChain.Free; if FBitmaps <> nil then for Key in FBitmaps.Keys do FBitmaps[Key].Free; FBitmaps.Free; inherited; end; // Calculate height for text drawable D function TVariableHeight.GetTextHeight(const D: TListItemText; const Width: single; const Text: string): Integer; var Layout: TTextLayout; begin // Create a TTextLayout to measure text dimensions Layout := TTextLayoutManager.DefaultTextLayout.Create; try Layout.BeginUpdate; try // Initialize layout parameters with those of the drawable Layout.Font.Assign(D.Font); Layout.VerticalAlign := D.TextVertAlign; Layout.HorizontalAlign := D.TextAlign; Layout.WordWrap := D.WordWrap; Layout.Trimming := D.Trimming; Layout.MaxSize := TPointF.Create(Width, TTextLayout.MaxLayoutSize.Y); Layout.Text := Text; finally Layout.EndUpdate; end; // Get layout height Result := Round(Layout.Height); // Add one em to the height Layout.Text := 'm'; Result := Result + Round(Layout.Height); finally Layout.Free; end; end; procedure TVariableHeight.ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); var Drawable: TListItemText; SizeImg: TListItemImage; Text: string; AvailableWidth: Single; begin SizeImg := TListItemImage(AItem.View.FindDrawable('imgSize')); AvailableWidth := TListView(Sender).Width - TListView(Sender).ItemSpaces.Left - TListView(Sender).ItemSpaces.Right - SizeImg.Width; ShowMessage(TListView(Sender).Height.ToString); // Find the text drawable which is used to calcualte item size. // For dynamic appearance, use item name. // For classic appearances use TListViewItem.TObjectNames.Text // Drawable := TListItemText(AItem.View.FindDrawable(TListViewItem.TObjectNames.Text)); Drawable := TListItemText(AItem.View.FindDrawable('txtMain')); Text := Drawable.Text; // Randomize the font when updating for the first time if Drawable.TagFloat = 0 then begin Drawable.Font.Size := 1; // Ensure that default font sizes do not play against us Drawable.Font.Size := 10 + Random(4) * 4; Drawable.TagFloat := Drawable.Font.Size; if Text.Length < 100 then Drawable.Font.Style := [TFontStyle.fsBold]; end; // Calculate item height based on text in the drawable AItem.Height := GetTextHeight(Drawable, AvailableWidth, Text); Drawable.Height := AItem.Height; Drawable.Width := AvailableWidth; SizeImg.OwnsBitmap := False; SizeImg.Bitmap := GetDimensionBitmap(SizeImg.Width, AItem.Height); end; procedure TVariableHeight.ReadText; const Delimiters: array of char = [#10, #13]; var Reader: TStreamReader; Stream: TResourceStream; begin if Length(FText) = 0 then begin Stream := TResourceStream.Create(HInstance, 'Blabla', RT_RCDATA); Reader := TStreamReader.Create(Stream); try FText := Reader.ReadToEnd.Split(Delimiters, TStringSplitOptions.ExcludeEmpty) finally Reader.Close; Reader.Free; Stream.Free; end; end; end; end. object VariableHeight: TVariableHeight Left = 0 Top = 0 Caption = 'VariableHeight' ClientHeight = 480 ClientWidth = 510 FormFactor.Width = 320 FormFactor.Height = 480 FormFactor.Devices = [Desktop] DesignerMasterStyle = 0 object ListView1: TListView ItemAppearanceClassName = 'TDynamicAppearance' ItemEditAppearanceClassName = 'TDynamicAppearance' HeaderAppearanceClassName = 'TListHeaderObjects' FooterAppearanceClassName = 'TListHeaderObjects' OnUpdateObjects = ListView1UpdateObjects Align = Client Size.Width = 510.000000000000000000 Size.Height = 436.000000000000000000 Size.PlatformDefault = False TabOrder = 0 ItemAppearanceObjects.ItemObjects.ObjectsCollection = < item AppearanceObjectName = 'txtMain' AppearanceClassName = 'TTextObjectAppearance' Appearance.TextAlign = Leading Appearance.WordWrap = True Appearance.Height = 44.000000000000000000 Appearance.VertAlign = Center end item AppearanceObjectName = 'imgSize' AppearanceClassName = 'TImageObjectAppearance' Appearance.ScalingMode = Original Appearance.Width = 30.000000000000000000 Appearance.Align = Trailing end> ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = < item AppearanceObjectName = 'Text1' AppearanceClassName = 'TTextObjectAppearance' end> end object ToolBar1: TToolBar Padding.Top = 4.000000000000000000 Padding.Bottom = 4.000000000000000000 Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False TabOrder = 1 object Label1: TLabel Align = Contents Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False StyleLookup = 'toollabel' TextSettings.HorzAlign = Center Text = 'Variable Row Height Demo' end object Button1: TButton Align = Right Margins.Right = 5.000000000000000000 Position.X = 448.000000000000000000 Position.Y = 4.000000000000000000 Size.Width = 57.000000000000000000 Size.Height = 36.000000000000000000 Size.PlatformDefault = False StyleLookup = 'listitembutton' TabOrder = 1 Text = 'Fill List' OnClick = Button1Click end end end

Delphi 默认字体大小不会对我们不利 Drawable.Font.Size:=10+随机（4）*4； Drawable.TagFloat:=Drawable.Font.Size；如果Text.Length ItemAppearanceObjects.ItemEditObjects.ObjectsCollection=< 项目 AppearanceObjectName='Text1' AppearanceClassName='TTextObjectAppearance' 结束> 结束对象工具栏1:t工具栏 Padding.Top=4.000000000000000000000000 Padding.Bottom=4.000000000000000000000000 大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False TabOrder=1 对象标签1:TLabel 对齐=内容大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False StyleLookup='toollabel' TextSettings.HorzAlign=Center Text='可变行高演示' 结束对象按钮1:t按钮对齐=右页边距。右侧=5.000000000000000000000000 位置X=448.000000000000000000000000000000 位置Y=4.000000000000000000000000 大小.宽度=57.000000000000000000 大小.高度=36.000000000000000000000000 Size.PlatformDefault=False StyleLookup='listitembutton' TabOrder=1 Text='填充列表' OnClick=按钮1单击结束结束结束你的循环中只有一个输入错误。@Olivier，你能说得具体点吗。我检查了它哪一个是打字错误？在Items数组中使用I代替1。 unit MainForm; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, System.Generics.Collections, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Controls.Presentation, FMX.StdCtrls, FMX.ListView.Types, FMX.ListView.Appearances, FMX.ListView.Adapters.Base, FMX.ListView, Markov; type TVariableHeight = class(TForm) Button1: TButton; ListView1: TListView; ToolBar1: TToolBar; Label1: TLabel; procedure Button1Click(Sender: TObject); procedure ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); private FChain: TChain; FBitmaps: TDictionary<Integer, TBitmap>; FText: TArray<string>; procedure ReadText; function GetDimensionBitmap(const Width, Height: Single): TBitmap; public function GetTextHeight(const D: TListItemText; const Width: Single; const Text: string): Integer; destructor Destroy; override; end; var VariableHeight: TVariableHeight; implementation uses System.IOUtils, FMX.TextLayout; {$R *.fmx} // Create a new item with random text of random length procedure TVariableHeight.Button1Click(Sender: TObject); begin ReadText; ListView1.Items.Add.Data['txtMain'] := FText[Random(Length(FText))]; // with classic appearances, use Text property //ListView1.Items.Add.Text := FChain.Generate(Random(100) + 5); end; function TVariableHeight.GetDimensionBitmap(const Width, Height: Single): TBitmap; procedure Arrow(C: TCanvas; P: array of TPointF); begin C.DrawLine(P[0], P[1], 1.0); C.DrawLine(P[0], P[2], 1.0); C.DrawLine(P[0], P[3], 1.0); end; var EndP1, EndP2: TPointF; TextBitmap: TBitmap; IntHeight: Integer; begin IntHeight := Trunc(Height); if FBitmaps = nil then FBitmaps := TDictionary<Integer, TBitmap>.Create; if not FBitmaps.TryGetValue(IntHeight, Result) then begin Result := TBitmap.Create(Trunc(Width), IntHeight); FBitmaps.Add(IntHeight, Result); if Result.Canvas.BeginScene then begin Result.Canvas.Clear(TAlphaColorRec.Null); Result.Canvas.Stroke.Color := TAlphaColorRec.Darkgray; // Draw the arrows EndP1 := TPointF.Create(Width/2, 0); EndP2 := TPointF.Create(Width/2, Height); Arrow(Result.Canvas, [EndP1, TPointF.Create(Width/2, Height/2 - Width/2), EndP1 + TPointF.Create(-2, 5), EndP1 + TPointF.Create(2, 5)]); Arrow(Result.Canvas, [EndP2, TPointF.Create(Width/2, Height/2 + Width/2), EndP2 + TPointF.Create(-2, -5), EndP2 + TPointF.Create(2, -5)]); // Draw the dimension text TextBitmap := TBitmap.Create(Trunc(Width), Trunc(Width)); try if TextBitmap.Canvas.BeginScene then with TextBitmap.Canvas do begin Clear(TAlphaColorRec.Null); Fill.Color := TAlphaColorRec.Darkgray; FillText(TextBitmap.BoundsF, ''.Format('%d', [IntHeight]), False, 1, [], TTextAlign.Center, TTextAlign.Center); EndScene; end; TextBitmap.Rotate(90); Result.Canvas.DrawBitmap(TextBitmap, TextBitmap.BoundsF, TextBitmap.BoundsF.CenterAt(Result.BoundsF), 1); finally TextBitmap.Free; end; Result.Canvas.EndScene; end; end; end; destructor TVariableHeight.Destroy; var Key: Integer; begin FChain.Free; if FBitmaps <> nil then for Key in FBitmaps.Keys do FBitmaps[Key].Free; FBitmaps.Free; inherited; end; // Calculate height for text drawable D function TVariableHeight.GetTextHeight(const D: TListItemText; const Width: single; const Text: string): Integer; var Layout: TTextLayout; begin // Create a TTextLayout to measure text dimensions Layout := TTextLayoutManager.DefaultTextLayout.Create; try Layout.BeginUpdate; try // Initialize layout parameters with those of the drawable Layout.Font.Assign(D.Font); Layout.VerticalAlign := D.TextVertAlign; Layout.HorizontalAlign := D.TextAlign; Layout.WordWrap := D.WordWrap; Layout.Trimming := D.Trimming; Layout.MaxSize := TPointF.Create(Width, TTextLayout.MaxLayoutSize.Y); Layout.Text := Text; finally Layout.EndUpdate; end; // Get layout height Result := Round(Layout.Height); // Add one em to the height Layout.Text := 'm'; Result := Result + Round(Layout.Height); finally Layout.Free; end; end; procedure TVariableHeight.ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); var Drawable: TListItemText; SizeImg: TListItemImage; Text: string; AvailableWidth: Single; begin SizeImg := TListItemImage(AItem.View.FindDrawable('imgSize')); AvailableWidth := TListView(Sender).Width - TListView(Sender).ItemSpaces.Left - TListView(Sender).ItemSpaces.Right - SizeImg.Width; ShowMessage(TListView(Sender).Height.ToString); // Find the text drawable which is used to calcualte item size. // For dynamic appearance, use item name. // For classic appearances use TListViewItem.TObjectNames.Text // Drawable := TListItemText(AItem.View.FindDrawable(TListViewItem.TObjectNames.Text)); Drawable := TListItemText(AItem.View.FindDrawable('txtMain')); Text := Drawable.Text; // Randomize the font when updating for the first time if Drawable.TagFloat = 0 then begin Drawable.Font.Size := 1; // Ensure that default font sizes do not play against us Drawable.Font.Size := 10 + Random(4) * 4; Drawable.TagFloat := Drawable.Font.Size; if Text.Length < 100 then Drawable.Font.Style := [TFontStyle.fsBold]; end; // Calculate item height based on text in the drawable AItem.Height := GetTextHeight(Drawable, AvailableWidth, Text); Drawable.Height := AItem.Height; Drawable.Width := AvailableWidth; SizeImg.OwnsBitmap := False; SizeImg.Bitmap := GetDimensionBitmap(SizeImg.Width, AItem.Height); end; procedure TVariableHeight.ReadText; const Delimiters: array of char = [#10, #13]; var Reader: TStreamReader; Stream: TResourceStream; begin if Length(FText) = 0 then begin Stream := TResourceStream.Create(HInstance, 'Blabla', RT_RCDATA); Reader := TStreamReader.Create(Stream); try FText := Reader.ReadToEnd.Split(Delimiters, TStringSplitOptions.ExcludeEmpty) finally Reader.Close; Reader.Free; Stream.Free; end; end; end; end. object VariableHeight: TVariableHeight Left = 0 Top = 0 Caption = 'VariableHeight' ClientHeight = 480 ClientWidth = 510 FormFactor.Width = 320 FormFactor.Height = 480 FormFactor.Devices = [Desktop] DesignerMasterStyle = 0 object ListView1: TListView ItemAppearanceClassName = 'TDynamicAppearance' ItemEditAppearanceClassName = 'TDynamicAppearance' HeaderAppearanceClassName = 'TListHeaderObjects' FooterAppearanceClassName = 'TListHeaderObjects' OnUpdateObjects = ListView1UpdateObjects Align = Client Size.Width = 510.000000000000000000 Size.Height = 436.000000000000000000 Size.PlatformDefault = False TabOrder = 0 ItemAppearanceObjects.ItemObjects.ObjectsCollection = < item AppearanceObjectName = 'txtMain' AppearanceClassName = 'TTextObjectAppearance' Appearance.TextAlign = Leading Appearance.WordWrap = True Appearance.Height = 44.000000000000000000 Appearance.VertAlign = Center end item AppearanceObjectName = 'imgSize' AppearanceClassName = 'TImageObjectAppearance' Appearance.ScalingMode = Original Appearance.Width = 30.000000000000000000 Appearance.Align = Trailing end> ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = < item AppearanceObjectName = 'Text1' AppearanceClassName = 'TTextObjectAppearance' end> end object ToolBar1: TToolBar Padding.Top = 4.000000000000000000 Padding.Bottom = 4.000000000000000000 Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False TabOrder = 1 object Label1: TLabel Align = Contents Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False StyleLookup = 'toollabel' TextSettings.HorzAlign = Center Text = 'Variable Row Height Demo' end object Button1: TButton Align = Right Margins.Right = 5.000000000000000000 Position.X = 448.000000000000000000 Position.Y = 4.000000000000000000 Size.Width = 57.000000000000000000 Size.Height = 36.000000000000000000 Size.PlatformDefault = False StyleLookup = 'listitembutton' TabOrder = 1 Text = 'Fill List' OnClick = Button1Click end end end

delphi

Delphi 默认字体大小不会对我们不利 Drawable.Font.Size:=10+随机（4）*4； Drawable.TagFloat:=Drawable.Font.Size；如果Text.Length ItemAppearanceObjects.ItemEditObjects.ObjectsCollection=< 项目 AppearanceObjectName='Text1' AppearanceClassName='TTextObjectAppearance' 结束> 结束对象工具栏1:t工具栏 Padding.Top=4.000000000000000000000000 Padding.Bottom=4.000000000000000000000000 大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False TabOrder=1 对象标签1:TLabel 对齐=内容大小.宽度=510.000000000000000000 大小.高度=44.000000000000000000000000 Size.PlatformDefault=False StyleLookup='toollabel' TextSettings.HorzAlign=Center Text='可变行高演示' 结束对象按钮1:t按钮对齐=右页边距。右侧=5.000000000000000000000000 位置X=448.000000000000000000000000000000 位置Y=4.000000000000000000000000 大小.宽度=57.000000000000000000 大小.高度=36.000000000000000000000000 Size.PlatformDefault=False StyleLookup='listitembutton' TabOrder=1 Text='填充列表' OnClick=按钮1单击结束结束结束你的循环中只有一个输入错误。@Olivier，你能说得具体点吗。我检查了它哪一个是打字错误？在Items数组中使用I代替1。 unit MainForm; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, System.Generics.Collections, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Controls.Presentation, FMX.StdCtrls, FMX.ListView.Types, FMX.ListView.Appearances, FMX.ListView.Adapters.Base, FMX.ListView, Markov; type TVariableHeight = class(TForm) Button1: TButton; ListView1: TListView; ToolBar1: TToolBar; Label1: TLabel; procedure Button1Click(Sender: TObject); procedure ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); private FChain: TChain; FBitmaps: TDictionary<Integer, TBitmap>; FText: TArray<string>; procedure ReadText; function GetDimensionBitmap(const Width, Height: Single): TBitmap; public function GetTextHeight(const D: TListItemText; const Width: Single; const Text: string): Integer; destructor Destroy; override; end; var VariableHeight: TVariableHeight; implementation uses System.IOUtils, FMX.TextLayout; {$R *.fmx} // Create a new item with random text of random length procedure TVariableHeight.Button1Click(Sender: TObject); begin ReadText; ListView1.Items.Add.Data['txtMain'] := FText[Random(Length(FText))]; // with classic appearances, use Text property //ListView1.Items.Add.Text := FChain.Generate(Random(100) + 5); end; function TVariableHeight.GetDimensionBitmap(const Width, Height: Single): TBitmap; procedure Arrow(C: TCanvas; P: array of TPointF); begin C.DrawLine(P[0], P[1], 1.0); C.DrawLine(P[0], P[2], 1.0); C.DrawLine(P[0], P[3], 1.0); end; var EndP1, EndP2: TPointF; TextBitmap: TBitmap; IntHeight: Integer; begin IntHeight := Trunc(Height); if FBitmaps = nil then FBitmaps := TDictionary<Integer, TBitmap>.Create; if not FBitmaps.TryGetValue(IntHeight, Result) then begin Result := TBitmap.Create(Trunc(Width), IntHeight); FBitmaps.Add(IntHeight, Result); if Result.Canvas.BeginScene then begin Result.Canvas.Clear(TAlphaColorRec.Null); Result.Canvas.Stroke.Color := TAlphaColorRec.Darkgray; // Draw the arrows EndP1 := TPointF.Create(Width/2, 0); EndP2 := TPointF.Create(Width/2, Height); Arrow(Result.Canvas, [EndP1, TPointF.Create(Width/2, Height/2 - Width/2), EndP1 + TPointF.Create(-2, 5), EndP1 + TPointF.Create(2, 5)]); Arrow(Result.Canvas, [EndP2, TPointF.Create(Width/2, Height/2 + Width/2), EndP2 + TPointF.Create(-2, -5), EndP2 + TPointF.Create(2, -5)]); // Draw the dimension text TextBitmap := TBitmap.Create(Trunc(Width), Trunc(Width)); try if TextBitmap.Canvas.BeginScene then with TextBitmap.Canvas do begin Clear(TAlphaColorRec.Null); Fill.Color := TAlphaColorRec.Darkgray; FillText(TextBitmap.BoundsF, ''.Format('%d', [IntHeight]), False, 1, [], TTextAlign.Center, TTextAlign.Center); EndScene; end; TextBitmap.Rotate(90); Result.Canvas.DrawBitmap(TextBitmap, TextBitmap.BoundsF, TextBitmap.BoundsF.CenterAt(Result.BoundsF), 1); finally TextBitmap.Free; end; Result.Canvas.EndScene; end; end; end; destructor TVariableHeight.Destroy; var Key: Integer; begin FChain.Free; if FBitmaps <> nil then for Key in FBitmaps.Keys do FBitmaps[Key].Free; FBitmaps.Free; inherited; end; // Calculate height for text drawable D function TVariableHeight.GetTextHeight(const D: TListItemText; const Width: single; const Text: string): Integer; var Layout: TTextLayout; begin // Create a TTextLayout to measure text dimensions Layout := TTextLayoutManager.DefaultTextLayout.Create; try Layout.BeginUpdate; try // Initialize layout parameters with those of the drawable Layout.Font.Assign(D.Font); Layout.VerticalAlign := D.TextVertAlign; Layout.HorizontalAlign := D.TextAlign; Layout.WordWrap := D.WordWrap; Layout.Trimming := D.Trimming; Layout.MaxSize := TPointF.Create(Width, TTextLayout.MaxLayoutSize.Y); Layout.Text := Text; finally Layout.EndUpdate; end; // Get layout height Result := Round(Layout.Height); // Add one em to the height Layout.Text := 'm'; Result := Result + Round(Layout.Height); finally Layout.Free; end; end; procedure TVariableHeight.ListView1UpdateObjects(const Sender: TObject; const AItem: TListViewItem); var Drawable: TListItemText; SizeImg: TListItemImage; Text: string; AvailableWidth: Single; begin SizeImg := TListItemImage(AItem.View.FindDrawable('imgSize')); AvailableWidth := TListView(Sender).Width - TListView(Sender).ItemSpaces.Left - TListView(Sender).ItemSpaces.Right - SizeImg.Width; ShowMessage(TListView(Sender).Height.ToString); // Find the text drawable which is used to calcualte item size. // For dynamic appearance, use item name. // For classic appearances use TListViewItem.TObjectNames.Text // Drawable := TListItemText(AItem.View.FindDrawable(TListViewItem.TObjectNames.Text)); Drawable := TListItemText(AItem.View.FindDrawable('txtMain')); Text := Drawable.Text; // Randomize the font when updating for the first time if Drawable.TagFloat = 0 then begin Drawable.Font.Size := 1; // Ensure that default font sizes do not play against us Drawable.Font.Size := 10 + Random(4) * 4; Drawable.TagFloat := Drawable.Font.Size; if Text.Length < 100 then Drawable.Font.Style := [TFontStyle.fsBold]; end; // Calculate item height based on text in the drawable AItem.Height := GetTextHeight(Drawable, AvailableWidth, Text); Drawable.Height := AItem.Height; Drawable.Width := AvailableWidth; SizeImg.OwnsBitmap := False; SizeImg.Bitmap := GetDimensionBitmap(SizeImg.Width, AItem.Height); end; procedure TVariableHeight.ReadText; const Delimiters: array of char = [#10, #13]; var Reader: TStreamReader; Stream: TResourceStream; begin if Length(FText) = 0 then begin Stream := TResourceStream.Create(HInstance, 'Blabla', RT_RCDATA); Reader := TStreamReader.Create(Stream); try FText := Reader.ReadToEnd.Split(Delimiters, TStringSplitOptions.ExcludeEmpty) finally Reader.Close; Reader.Free; Stream.Free; end; end; end; end. object VariableHeight: TVariableHeight Left = 0 Top = 0 Caption = 'VariableHeight' ClientHeight = 480 ClientWidth = 510 FormFactor.Width = 320 FormFactor.Height = 480 FormFactor.Devices = [Desktop] DesignerMasterStyle = 0 object ListView1: TListView ItemAppearanceClassName = 'TDynamicAppearance' ItemEditAppearanceClassName = 'TDynamicAppearance' HeaderAppearanceClassName = 'TListHeaderObjects' FooterAppearanceClassName = 'TListHeaderObjects' OnUpdateObjects = ListView1UpdateObjects Align = Client Size.Width = 510.000000000000000000 Size.Height = 436.000000000000000000 Size.PlatformDefault = False TabOrder = 0 ItemAppearanceObjects.ItemObjects.ObjectsCollection = < item AppearanceObjectName = 'txtMain' AppearanceClassName = 'TTextObjectAppearance' Appearance.TextAlign = Leading Appearance.WordWrap = True Appearance.Height = 44.000000000000000000 Appearance.VertAlign = Center end item AppearanceObjectName = 'imgSize' AppearanceClassName = 'TImageObjectAppearance' Appearance.ScalingMode = Original Appearance.Width = 30.000000000000000000 Appearance.Align = Trailing end> ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = < item AppearanceObjectName = 'Text1' AppearanceClassName = 'TTextObjectAppearance' end> end object ToolBar1: TToolBar Padding.Top = 4.000000000000000000 Padding.Bottom = 4.000000000000000000 Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False TabOrder = 1 object Label1: TLabel Align = Contents Size.Width = 510.000000000000000000 Size.Height = 44.000000000000000000 Size.PlatformDefault = False StyleLookup = 'toollabel' TextSettings.HorzAlign = Center Text = 'Variable Row Height Demo' end object Button1: TButton Align = Right Margins.Right = 5.000000000000000000 Position.X = 448.000000000000000000 Position.Y = 4.000000000000000000 Size.Width = 57.000000000000000000 Size.Height = 36.000000000000000000 Size.PlatformDefault = False StyleLookup = 'listitembutton' TabOrder = 1 Text = 'Fill List' OnClick = Button1Click end end end,delphi,firemonkey,tlistview,Delphi,Firemonkey,Tlistview,.FMX文件 object VariableHeight: TVariableHeight Left = 0 Top = 0 Caption = 'VariableHeight' ClientHeight = 480 ClientWidth = 510 FormFactor.Width = 320 FormFactor.Height = 480 FormFactor.Devices = [Desktop] DesignerMasterStyle = 0 o

.FMX文件

object VariableHeight: TVariableHeight
  Left = 0
  Top = 0
  Caption = 'VariableHeight'
  ClientHeight = 480
  ClientWidth = 510
  FormFactor.Width = 320
  FormFactor.Height = 480
  FormFactor.Devices = [Desktop]
  DesignerMasterStyle = 0
  object ListView1: TListView
    ItemAppearanceClassName = 'TDynamicAppearance'
    ItemEditAppearanceClassName = 'TDynamicAppearance'
    HeaderAppearanceClassName = 'TListHeaderObjects'
    FooterAppearanceClassName = 'TListHeaderObjects'
    OnUpdateObjects = ListView1UpdateObjects
    Align = Client
    Size.Width = 510.000000000000000000
    Size.Height = 436.000000000000000000
    Size.PlatformDefault = False
    TabOrder = 0
    ItemAppearanceObjects.ItemObjects.ObjectsCollection = <
      item
        AppearanceObjectName = 'txtMain'
        AppearanceClassName = 'TTextObjectAppearance'
        Appearance.TextAlign = Leading
        Appearance.WordWrap = True
        Appearance.Height = 44.000000000000000000
        Appearance.VertAlign = Center
      end
      item
        AppearanceObjectName = 'imgSize'
        AppearanceClassName = 'TImageObjectAppearance'
        Appearance.ScalingMode = Original
        Appearance.Width = 30.000000000000000000
        Appearance.Align = Trailing
      end>
    ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = <
      item
        AppearanceObjectName = 'Text1'
        AppearanceClassName = 'TTextObjectAppearance'
      end>
  end
  object ToolBar1: TToolBar
    Padding.Top = 4.000000000000000000
    Padding.Bottom = 4.000000000000000000
    Size.Width = 510.000000000000000000
    Size.Height = 44.000000000000000000
    Size.PlatformDefault = False
    TabOrder = 1
    object Label1: TLabel
      Align = Contents
      Size.Width = 510.000000000000000000
      Size.Height = 44.000000000000000000
      Size.PlatformDefault = False
      StyleLookup = 'toollabel'
      TextSettings.HorzAlign = Center
      Text = 'Variable Row Height Demo'
    end
    object Button1: TButton
      Align = Right
      Margins.Right = 5.000000000000000000
      Position.X = 448.000000000000000000
      Position.Y = 4.000000000000000000
      Size.Width = 57.000000000000000000
      Size.Height = 36.000000000000000000
      Size.PlatformDefault = False
      StyleLookup = 'listitembutton'
      TabOrder = 1
      Text = 'Fill List'
      OnClick = Button1Click
    end
  end
end

对象可变高度：TVariableHeight
左=0
Top=0
标题='VariableHeight'
ClientHeight=480
ClientWidth=510
FormFactor.Width=320
FormFactor.Height=480
FormFactor.Devices=[桌面]
DesignerMasterStyle=0
对象列表视图1:TListView
ItemAppearanceClassName='TDynamicAppearance'
ItemEditAppearanceClassName='TDynamicAppearance'
HeaderAppearanceClassName='tListHeaderObject'
FooterAppearanceClassName='tListHeaderObject'
onUpdate对象=ListView1Update对象
Align=客户端
大小.宽度=510.000000000000000000
大小.高度=436.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Size.PlatformDefault=False
TabOrder=0
ItemAppearanceObjects.ItemObjects.ObjectsCollection=<
项目
AppearanceObjectName='txtMain'
AppearanceClassName='TTextObjectAppearance'
外观.TextAlign=前导
Appearance.WordWrap=True
外观.高度=44.000000000000000000000000
外观。垂直对齐=中心
结束
项目
AppearanceObjectName='imgSize'
AppearanceClassName='TImageObjectAppearance'
外观.缩放模式=原始
外观.宽度=30.000000000000000000000000
外观.Align=training
结束>
ItemAppearanceObjects.ItemEditObjects.ObjectsCollection=<
项目
AppearanceObjectName='Text1'
AppearanceClassName='TTextObjectAppearance'
结束>
结束
对象工具栏1:t工具栏
Padding.Top=4.000000000000000000000000
Padding.Bottom=4.000000000000000000000000
大小.宽度=510.000000000000000000
大小.高度=44.000000000000000000000000
Size.PlatformDefault=False
TabOrder=1
对象标签1:TLabel
对齐=内容
大小.宽度=510.000000000000000000
大小.高度=44.000000000000000000000000
Size.PlatformDefault=False
StyleLookup='toollabel'
TextSettings.HorzAlign=Center
Text='可变行高演示'
结束
对象按钮1:t按钮
对齐=右
页边距。右侧=5.000000000000000000000000
位置X=448.000000000000000000000000000000
位置Y=4.000000000000000000000000
大小.宽度=57.000000000000000000
大小.高度=36.000000000000000000000000
Size.PlatformDefault=False
StyleLookup='listitembutton'
TabOrder=1
Text='填充列表'
OnClick=按钮1单击
结束
结束
结束

你的循环中只有一个输入错误。@Olivier，你能说得具体点吗。我检查了它哪一个是打字错误？在Items数组中使用I代替1。

unit MainForm;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  System.Generics.Collections,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs,
  FMX.Controls.Presentation, FMX.StdCtrls, FMX.ListView.Types,
  FMX.ListView.Appearances, FMX.ListView.Adapters.Base, FMX.ListView,
  Markov;

type
  TVariableHeight = class(TForm)
    Button1: TButton;
    ListView1: TListView;
    ToolBar1: TToolBar;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure ListView1UpdateObjects(const Sender: TObject;
      const AItem: TListViewItem);
  private
    FChain: TChain;
    FBitmaps: TDictionary<Integer, TBitmap>;
    FText: TArray<string>;
    procedure ReadText;
    function GetDimensionBitmap(const Width, Height: Single): TBitmap;
  public
    function GetTextHeight(const D: TListItemText; const Width: Single; const Text: string): Integer;
    destructor Destroy; override;
  end;

var
  VariableHeight: TVariableHeight;

implementation

uses
  System.IOUtils, FMX.TextLayout;

{$R *.fmx}

// Create a new item with random text of random length
procedure TVariableHeight.Button1Click(Sender: TObject);
begin
  ReadText;
  ListView1.Items.Add.Data['txtMain'] := FText[Random(Length(FText))];
  // with classic appearances, use Text property
  //ListView1.Items.Add.Text := FChain.Generate(Random(100) + 5);
end;

function TVariableHeight.GetDimensionBitmap(const Width, Height: Single): TBitmap;
  procedure Arrow(C: TCanvas; P: array of TPointF);
  begin
    C.DrawLine(P[0], P[1], 1.0);
    C.DrawLine(P[0], P[2], 1.0);
    C.DrawLine(P[0], P[3], 1.0);
  end;

var
  EndP1, EndP2: TPointF;
  TextBitmap: TBitmap;
  IntHeight: Integer;
begin
  IntHeight := Trunc(Height);

  if FBitmaps = nil then
    FBitmaps := TDictionary<Integer, TBitmap>.Create;
  if not FBitmaps.TryGetValue(IntHeight, Result) then
  begin
    Result := TBitmap.Create(Trunc(Width), IntHeight);
    FBitmaps.Add(IntHeight, Result);
    if Result.Canvas.BeginScene then
    begin
      Result.Canvas.Clear(TAlphaColorRec.Null);
      Result.Canvas.Stroke.Color := TAlphaColorRec.Darkgray;

      // Draw the arrows
      EndP1 := TPointF.Create(Width/2, 0);
      EndP2 := TPointF.Create(Width/2, Height);
      Arrow(Result.Canvas,
        [EndP1, TPointF.Create(Width/2, Height/2 - Width/2),
         EndP1 + TPointF.Create(-2, 5), EndP1 + TPointF.Create(2, 5)]);
      Arrow(Result.Canvas,
        [EndP2, TPointF.Create(Width/2, Height/2 + Width/2),
         EndP2 + TPointF.Create(-2, -5), EndP2 + TPointF.Create(2, -5)]);

      // Draw the dimension text
      TextBitmap := TBitmap.Create(Trunc(Width), Trunc(Width));
      try
        if TextBitmap.Canvas.BeginScene then
          with TextBitmap.Canvas do
          begin
            Clear(TAlphaColorRec.Null);
            Fill.Color := TAlphaColorRec.Darkgray;
            FillText(TextBitmap.BoundsF, ''.Format('%d', [IntHeight]), False, 1,
              [], TTextAlign.Center, TTextAlign.Center);
            EndScene;
          end;
        TextBitmap.Rotate(90);
        Result.Canvas.DrawBitmap(TextBitmap, TextBitmap.BoundsF,
          TextBitmap.BoundsF.CenterAt(Result.BoundsF), 1);
      finally
        TextBitmap.Free;
      end;

      Result.Canvas.EndScene;
    end;
  end;
end;

destructor TVariableHeight.Destroy;
var
  Key: Integer;
begin
  FChain.Free;
  if FBitmaps <> nil then
    for Key in FBitmaps.Keys do
      FBitmaps[Key].Free;
  FBitmaps.Free;
  inherited;
end;

// Calculate height for text drawable D
function TVariableHeight.GetTextHeight(const D: TListItemText; const Width: single; const Text: string): Integer;
var
  Layout: TTextLayout;
begin
  // Create a TTextLayout to measure text dimensions
  Layout := TTextLayoutManager.DefaultTextLayout.Create;
  try
    Layout.BeginUpdate;
    try
      // Initialize layout parameters with those of the drawable
      Layout.Font.Assign(D.Font);
      Layout.VerticalAlign := D.TextVertAlign;
      Layout.HorizontalAlign := D.TextAlign;
      Layout.WordWrap := D.WordWrap;
      Layout.Trimming := D.Trimming;
      Layout.MaxSize := TPointF.Create(Width, TTextLayout.MaxLayoutSize.Y);
      Layout.Text := Text;
    finally
      Layout.EndUpdate;
    end;
    // Get layout height
    Result := Round(Layout.Height);
    // Add one em to the height
    Layout.Text := 'm';
    Result := Result + Round(Layout.Height);
  finally
    Layout.Free;
  end;
end;

procedure TVariableHeight.ListView1UpdateObjects(const Sender: TObject;
  const AItem: TListViewItem);
var
  Drawable: TListItemText;
  SizeImg: TListItemImage;
  Text: string;
  AvailableWidth: Single;
begin
  SizeImg := TListItemImage(AItem.View.FindDrawable('imgSize'));
  AvailableWidth := TListView(Sender).Width - TListView(Sender).ItemSpaces.Left
    - TListView(Sender).ItemSpaces.Right - SizeImg.Width;
  ShowMessage(TListView(Sender).Height.ToString);

  // Find the text drawable which is used to calcualte item size.
  // For dynamic appearance, use item name.
  // For classic appearances use TListViewItem.TObjectNames.Text
  // Drawable := TListItemText(AItem.View.FindDrawable(TListViewItem.TObjectNames.Text));
  Drawable := TListItemText(AItem.View.FindDrawable('txtMain'));
  Text := Drawable.Text;

  // Randomize the font when updating for the first time
  if Drawable.TagFloat = 0 then
  begin
    Drawable.Font.Size := 1; // Ensure that default font sizes do not play against us
    Drawable.Font.Size := 10 + Random(4) * 4;

    Drawable.TagFloat := Drawable.Font.Size;
    if Text.Length < 100 then
      Drawable.Font.Style := [TFontStyle.fsBold];
  end;

  // Calculate item height based on text in the drawable
  AItem.Height := GetTextHeight(Drawable, AvailableWidth, Text);
  Drawable.Height := AItem.Height;
  Drawable.Width := AvailableWidth;

  SizeImg.OwnsBitmap := False;
  SizeImg.Bitmap := GetDimensionBitmap(SizeImg.Width, AItem.Height);
end;

procedure TVariableHeight.ReadText;
const
  Delimiters: array of char = [#10, #13];
var
  Reader: TStreamReader;
  Stream: TResourceStream;
begin
  if Length(FText) = 0 then
  begin
    Stream := TResourceStream.Create(HInstance, 'Blabla', RT_RCDATA);
    Reader := TStreamReader.Create(Stream);
    try
      FText := Reader.ReadToEnd.Split(Delimiters, TStringSplitOptions.ExcludeEmpty)
    finally
      Reader.Close;
      Reader.Free;
      Stream.Free;
    end;
  end;
end;

end.

object VariableHeight: TVariableHeight
  Left = 0
  Top = 0
  Caption = 'VariableHeight'
  ClientHeight = 480
  ClientWidth = 510
  FormFactor.Width = 320
  FormFactor.Height = 480
  FormFactor.Devices = [Desktop]
  DesignerMasterStyle = 0
  object ListView1: TListView
    ItemAppearanceClassName = 'TDynamicAppearance'
    ItemEditAppearanceClassName = 'TDynamicAppearance'
    HeaderAppearanceClassName = 'TListHeaderObjects'
    FooterAppearanceClassName = 'TListHeaderObjects'
    OnUpdateObjects = ListView1UpdateObjects
    Align = Client
    Size.Width = 510.000000000000000000
    Size.Height = 436.000000000000000000
    Size.PlatformDefault = False
    TabOrder = 0
    ItemAppearanceObjects.ItemObjects.ObjectsCollection = <
      item
        AppearanceObjectName = 'txtMain'
        AppearanceClassName = 'TTextObjectAppearance'
        Appearance.TextAlign = Leading
        Appearance.WordWrap = True
        Appearance.Height = 44.000000000000000000
        Appearance.VertAlign = Center
      end
      item
        AppearanceObjectName = 'imgSize'
        AppearanceClassName = 'TImageObjectAppearance'
        Appearance.ScalingMode = Original
        Appearance.Width = 30.000000000000000000
        Appearance.Align = Trailing
      end>
    ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = <
      item
        AppearanceObjectName = 'Text1'
        AppearanceClassName = 'TTextObjectAppearance'
      end>
  end
  object ToolBar1: TToolBar
    Padding.Top = 4.000000000000000000
    Padding.Bottom = 4.000000000000000000
    Size.Width = 510.000000000000000000
    Size.Height = 44.000000000000000000
    Size.PlatformDefault = False
    TabOrder = 1
    object Label1: TLabel
      Align = Contents
      Size.Width = 510.000000000000000000
      Size.Height = 44.000000000000000000
      Size.PlatformDefault = False
      StyleLookup = 'toollabel'
      TextSettings.HorzAlign = Center
      Text = 'Variable Row Height Demo'
    end
    object Button1: TButton
      Align = Right
      Margins.Right = 5.000000000000000000
      Position.X = 448.000000000000000000
      Position.Y = 4.000000000000000000
      Size.Width = 57.000000000000000000
      Size.Height = 36.000000000000000000
      Size.PlatformDefault = False
      StyleLookup = 'listitembutton'
      TabOrder = 1
      Text = 'Fill List'
      OnClick = Button1Click
    end
  end
end

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