Java 最后一个元素占据多余水平空间的SWT行布局?
我在水平Java 最后一个元素占据多余水平空间的SWT行布局?,java,layout,swt,Java,Layout,Swt,我在水平行布局中有两个元素。 我可以为第二个元素(例如200像素)指定一个(最小值)。此外 a) 如果壳的总宽度太小,则第二个图元将换行到新行。这在行布局中运行良好 b) 如果总数为“大”,则第二个(=最后一个)元素应占据多余的水平空间 b)是否可以使用行布局?或者我是否需要使用GridLayout并自行实现包装(例如,根据元素的大小,在网格布局中使用一列或两列) 行布局不支持您正在查找的内容。我建议使用GridLayout,并按照您的建议调整侦听器的大小,或者实现您自己的布局。我第一次尝试编写
行布局中有两个元素。
我可以为第二个元素(例如200像素)指定一个(最小值)。此外
a) 如果壳的总宽度太小,则第二个图元将换行到新行。这在行布局
中运行良好
b) 如果总数为“大”,则第二个(=最后一个)元素应占据多余的水平空间
b)是否可以使用行布局
?或者我是否需要使用GridLayout
并自行实现包装(例如,根据元素的大小,在网格布局中使用一列或两列)
行布局不支持您正在查找的内容。我建议使用GridLayout
,并按照您的建议调整侦听器的大小,或者实现您自己的布局。我第一次尝试编写一个自定义布局,结果很难。基于GridLayout
的第二种策略更简单。下面是自定义的组合
的初稿,该组合将其GridLayout
的列数切换为一列或两列,具体取决于其子级的大小
(我在调整分区大小时仍然存在闪烁问题。)
我的自定义布局仍然存在问题。也许你可以看看我的相关问题:
public class RowLayoutDemo {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new RowLayout());
Text firstElement = new Text(shell, SWT.NONE);
firstElement.setText("firstElement");
Text secondElement = new Text(shell, SWT.NONE);
secondElement.setText("secondElement");
secondElement.setBackground(new Color(null, 200, 0, 0));
int minWidth = 200;
RowData rowData = new RowData();
rowData.width = minWidth;
secondElement.setLayoutData(rowData);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
}
package org.treez.core.adaptable.composite;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Layout;
/**
* A row composite for only two children. If the children are too large for a single line, the second child is wrapped
* on a second line. The second child always grabs excess horizontal space. This composite automatically sets the
* LayoutData of its children. Therefore the LayoutData of the children should not be set manually.
*/
public class GrabbingRowComposite extends Composite {
//#region ATTRIBUTES
private int widthHintForFirstChild = 80;
private int minWidthForSecondChild = 200;
private boolean isSingleLine = true;
//#end region
//#region CONSTRUCTORS
public GrabbingRowComposite(Composite parent) {
super(parent);
super.setLayout(createLayout());
if (parent.getLayout() instanceof GridLayout) {
GridData gridData = new GridData(SWT.FILL, SWT.BEGINNING, true, false);
setLayoutData(gridData);
}
}
//#end region
//#region METHODS
private GridLayout createLayout() {
//create default layout for single line
GridLayout gridLayout = new GridLayout(2, false);
//change layout to use several lines if required
this.addControlListener(new ControlAdapter() {
@Override
public void controlResized(ControlEvent e) {
adaptLayout();
}
});
return gridLayout;
}
private void adaptLayout() {
int totalWidth = this.getBounds().width;
Control[] children = getChildren();
if (children.length < 2) {
return;
}
Control firstChild = children[0];
Control secondChild = children[1];
int firstChildWidth = children[0].getBounds().width;
setWidthHintForFirstChild(firstChild);
setGrapHorizontalSpaceForSecondChild(secondChild);
boolean isTooSmallForOneLine = totalWidth < firstChildWidth + minWidthForSecondChild;
if (isTooSmallForOneLine) {
setTwoLineLayout();
} else {
setSingleLineLayout();
}
}
private void setTwoLineLayout() {
if (isSingleLine) {
super.setLayout(new GridLayout(1, false));
updateLayoutOfParentAndGrandParent();
isSingleLine = false;
}
}
private void setSingleLineLayout() {
if (!isSingleLine) {
super.setLayout(new GridLayout(2, false));
updateLayoutOfParentAndGrandParent();
isSingleLine = true;
}
}
private void setWidthHintForFirstChild(Control firstChild) {
GridData firstGridData = new GridData();
firstGridData.widthHint = widthHintForFirstChild;
firstChild.setLayoutData(firstGridData);
}
private static void setGrapHorizontalSpaceForSecondChild(Control secondChild) {
GridData secondGridData = new GridData(SWT.FILL, SWT.FILL, true, false);
secondChild.setLayoutData(secondGridData);
}
private void updateLayoutOfParentAndGrandParent() {
Composite parent = getParent();
if (parent != null) {
parent.layout(true);
Composite grandParent = parent.getParent();
if (grandParent != null) {
grandParent.layout(true);
}
}
}
//#end region
//#region ACCESSORS
@Override
public void setLayout(Layout layout) {
throw new IllegalStateException("The layout of this composite must not be changed");
}
//#end region
}
package org.treez.core.adaptable.composite;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.forms.widgets.ExpandableComposite;
import org.eclipse.ui.forms.widgets.Section;
public class GrabbingRowCompositeDemo {
public static void main(String[] args) {
Shell shell = createShell();
shell.setSize(500, 300);
Section section = createSection(shell);
Composite parentComposite = createParentComposite(section);
createRow(parentComposite, "first");
createRow(parentComposite, "second");
createRow(parentComposite, "third");
section.clientVerticalSpacing = 0;
showUntilClosed(shell);
}
private static Shell createShell() {
Display display = new Display();
Shell shell = new Shell(display);
GridLayout shellGridLayout = new GridLayout(1, false);
shell.setLayout(shellGridLayout);
return shell;
}
private static Section createSection(Shell shell) {
Section section = new Section(
shell,
ExpandableComposite.TWISTIE | //
ExpandableComposite.EXPANDED | //
ExpandableComposite.TITLE_BAR | //
ExpandableComposite.CLIENT_INDENT);
GridData gridData = new GridData(SWT.FILL, SWT.BEGINNING, true, false);
section.setLayoutData(gridData);
return section;
}
private static Composite createParentComposite(Section section) {
Composite parentComposite = new Composite(section, SWT.NONE);
section.setClient(parentComposite);
parentComposite.setBackground(new Color(null, 0, 0, 255));
GridData gridData = new GridData(SWT.FILL, SWT.BEGINNING, true, false);
parentComposite.setLayoutData(gridData);
GridLayout gridLayout = new GridLayout(1, false);
parentComposite.setLayout(gridLayout);
return parentComposite;
}
private static Composite createRow(Composite parent, String text) {
GrabbingRowComposite row = new GrabbingRowComposite(parent);
row.setBackground(new Color(null, 255, 255, 255));
Label label = new Label(row, SWT.NONE);
label.setText(text);
Button checkBox = new Button(row, SWT.CHECK);
checkBox.setBackground(new Color(null, 255, 0, 0));
return row;
}
private static void showUntilClosed(Shell shell) {
shell.open();
Display display = Display.getCurrent();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}