Processing 如何让ControlP5下拉列表打开而不是关闭?
使用文档中的此MWE:Processing 如何让ControlP5下拉列表打开而不是关闭?,processing,control-p5,Processing,Control P5,使用文档中的此MWE: import controlP5.*; import java.util.*; ControlP5 cp5; void setup() { size(400, 400); cp5 = new ControlP5(this); List l = Arrays.asList("a", "b", "c", "d", "e", "f", &qu
import controlP5.*;
import java.util.*;
ControlP5 cp5;
void setup() {
size(400, 400);
cp5 = new ControlP5(this);
List l = Arrays.asList("a", "b", "c", "d", "e", "f", "g", "h");
/* add a ScrollableList, by default it behaves like a DropdownList */
cp5.addScrollableList("dropdown")
.setPosition(100, 100)
.setSize(200, 100)
.setBarHeight(20)
.setItemHeight(20)
.addItems(l)
// .setType(ScrollableList.LIST) // currently supported DROPDOWN and LIST
;
}
void draw() {
background(240);
}
如何使下拉列表打开而不是关闭?我正试图将列表放在屏幕的下边缘。我在文档中找不到选项。因为ControlP5使用Java泛型,所以在这种情况下,如果覆盖
ScrollableListView
的display()
方法,继承实际上相当棘手:
ScrollableList扩展控制器
- 在java中,类可以对单个类进行子类化,而不是对多个类进行子类化,因此像
这样的自定义子类将继承PopUpScrollableList
,而不是Controller
Controller
- 在
的ScrollableListView
中访问了一组属性,这些属性属于display()
,属于ScrollableList
或private
protected
ScrollableListView
的display()
方法,并且与自定义滚动列表的子类化相比,重新编译库听起来更容易
话虽如此,对于初学者来说,设置IDE和编译java库可能不是最友好的事情,因此我可以推荐一种黑客解决方法:简单地将列表的y位置移动,使其看起来在上面而不是下面:
import controlP5.*;
import java.util.*;
ControlP5 cp5;
ScrollableList list;
int listX = 100;
int listY = 100;
int listWidth = 200;
int listHeight = 100;
int barHeight = 20;
void setup() {
size(400, 400);
cp5 = new ControlP5(this);
List l = Arrays.asList("a", "b", "c", "d", "e", "f", "g", "h");
/* add a ScrollableList, by default it behaves like a DropdownList */
list = cp5.addScrollableList("dropdown")
.setPosition(listX, listY)
.setSize(listWidth, listHeight)
.setBarHeight(barHeight)
.setItemHeight(20)
.addItems(l)
// .setType(ScrollableList.LIST) // currently supported DROPDOWN and LIST
;
}
void draw() {
// hack: shift the list up when it's open
if(list.isOpen()){
list.setPosition(listX, listY - listHeight + barHeight);
}else{
list.setPosition(listX, listY);
}
background(240);
}
它在视觉上并不完美,可能是一种潜在的akward用户体验,但它是使用ControlP5实现这种定制行为的最简单的选项
另外,还值得考虑定制不同的UI库或写入自定义列表
为了便于讨论,以下是列表示例的修改版本:
/**
*单子
*
*
*一定要试试你的滚轮!
*/
导入de.bezier.guido.*;
列表框列表框;
简单按钮;
单击的对象;
无效设置()
{
尺寸(400400);
//任命经理
交互式。制作(此);
//创建一个列表框
列表框=新列表框(20,30,宽度-40,高度-80);
对于(int i=0,r=int(10+random(100));iheight;
}
public void mouseMoved(float mx,float my)
{
如果(!可见){
返回;
}
if(hasSlider&&mx>width-20)返回;
hoverItem=listStartAt+int((y-y)/itemHeight);
}
公共无效鼠标退出(浮动mx,浮动my)
{
如果(!可见){
返回;
}
悬停项=-1;
}
//经理打来的电话
无效鼠标标记(浮动mx,浮动my)
{
如果(!可见){
返回;
}
如果(!hasSlider)返回;
如果(mxwidth-20)返回;
int item=listStartAt+int((y-y)/itemHeight);
itemClicked(item,items.get(item));
}
无效提款()
{
如果(!可见){
返回;
}
仰泳();
填充(100);
rect(x,y,this.width,this.height);
如果(项!=null)
{
对于(int i=0;i/**
* A list
*
*
* Make sure to try your scroll wheel!
*/
import de.bezier.guido.*;
Listbox listbox;
SimpleButton button;
Object lastItemClicked;
void setup ()
{
size(400, 400);
// make the manager
Interactive.make( this );
// create a list box
listbox = new Listbox( 20, 30, width-40, height-80 );
for ( int i = 0, r = int(10+random(100)); i < r; i++ )
{
listbox.addItem( "Item " + i );
}
listbox.visible = false;
// create button
button = new SimpleButton("pop-up list", 20, 350, width-40, 24 );
}
void draw ()
{
background( 20 );
listbox.visible = button.on;
if ( lastItemClicked != null )
{
fill( 255 );
text( "Clicked " + lastItemClicked.toString(), 30, 20 );
}
}
public void itemClicked ( int i, Object item )
{
lastItemClicked = item;
}
public class Listbox
{
float x, y, width, height;
ArrayList items;
int itemHeight = 20;
int listStartAt = 0;
int hoverItem = -1;
float valueY = 0;
boolean hasSlider = false;
boolean visible = true;
Listbox ( float xx, float yy, float ww, float hh )
{
x = xx; y = yy;
valueY = y;
width = ww; height = hh;
// register it
Interactive.add( this );
}
public void addItem ( String item )
{
if ( items == null ) items = new ArrayList();
items.add( item );
hasSlider = items.size() * itemHeight > height;
}
public void mouseMoved ( float mx, float my )
{
if(!visible){
return;
}
if ( hasSlider && mx > width-20 ) return;
hoverItem = listStartAt + int((my-y) / itemHeight);
}
public void mouseExited ( float mx, float my )
{
if(!visible){
return;
}
hoverItem = -1;
}
// called from manager
void mouseDragged ( float mx, float my )
{
if(!visible){
return;
}
if ( !hasSlider ) return;
if ( mx < x+width-20 ) return;
valueY = my-10;
valueY = constrain( valueY, y, y+height-20 );
update();
}
// called from manager
void mouseScrolled ( float step )
{
if(!visible){
return;
}
valueY += step;
valueY = constrain( valueY, y, y+height-20 );
update();
}
void update ()
{
if(!visible){
return;
}
float totalHeight = items.size() * itemHeight;
float itemsInView = height / itemHeight;
float listOffset = map( valueY, y, y+height-20, 0, totalHeight-height );
listStartAt = int( listOffset / itemHeight );
}
public void mousePressed ( float mx, float my )
{
if(!visible){
return;
}
if ( hasSlider && mx > width-20 ) return;
int item = listStartAt + int( (my-y) / itemHeight);
itemClicked( item, items.get(item) );
}
void draw ()
{
if(!visible){
return;
}
noStroke();
fill( 100 );
rect( x,y,this.width,this.height );
if ( items != null )
{
for ( int i = 0; i < int(height/itemHeight) && i < items.size(); i++ )
{
stroke( 80 );
fill( (i+listStartAt) == hoverItem ? 200 : 120 );
rect( x, y + (i*itemHeight), this.width, itemHeight );
noStroke();
fill( 0 );
text( items.get(i+listStartAt).toString(), x+5, y+(i+1)*itemHeight-5 );
}
}
if ( hasSlider )
{
stroke( 80 );
fill( 100 );
rect( x+width-20, y, 20, height );
fill( 120 );
rect( x+width-20, valueY, 20, 20 );
}
}
}
public class SimpleButton
{
float x, y, width, height;
boolean on;
String label = "";
SimpleButton ( float xx, float yy, float w, float h )
{
x = xx; y = yy; width = w; height = h;
Interactive.add( this ); // register it with the manager
}
SimpleButton ( String label, float xx, float yy, float w, float h )
{
this(xx, yy, w, h);
this.label = label;
}
// called by manager
void mousePressed ()
{
on = !on;
}
void draw ()
{
if ( on ) fill( 200 );
else fill( 100 );
rect(x, y, width, height);
if ( on ) fill( 100 );
else fill( 200 );
text(label, x + 10, y + this.height * 0.65);
}
}