我试图用JavaFX证明一个可扩展的小部件,它与TitledPane
不同,因为标签周围的边框随着小部件的扩展而增长。我找到了一种方法。
然而,我有一个奇怪的故障,在扩展/折叠一次或两次后显示出来。
这是一个短视频的链接,其中问题出现在第三和第四次扩展:
Short Youtube Concept / Glitch Video
我已经用尽了我可以尝试让它表现出来的东西。
代码如下,为它的古怪道歉,希望在重构之前让它工作。
class ExpansionManager {
enum LayoutState {
INITIALIZE,
ANIMATING,
IDLE,
REQUEST_ANIMATION
}
LayoutState layoutState = LayoutState.INITIALIZE;
Double fromWidth = 0.0;
Double fromHeight = 0.0;
Double stepWidth = 0.0;
Double stepHeight = 0.0;
Double toWidth = 0.0;
Double toHeight = 0.0;
}
public class ExpandableTitledList extends VBox {
private Label title = new Label();
private ListProperty<String> listItem = new SimpleListProperty<>();
private ListView listView = new ListView<>(listItem);
Timeline timeline;
WritableValue<Double> writableHeight = new WritableValue<Double>() {
@Override
public Double getValue() {
return expansionManager.stepHeight;
}
@Override
public void setValue(Double value) {
expansionManager.stepHeight = value;
requestLayout();
}
};
WritableValue<Double> writableWidth = new WritableValue<Double>() {
@Override
public Double getValue() {
return expansionManager.stepWidth;
}
@Override
public void setValue(Double value) {
expansionManager.stepWidth = value;
requestLayout();
}
};
private boolean expanded = false;
ExpansionManager expansionManager = new ExpansionManager();
// private Dimension2D contractedDimension;
// private Dimension2D expandedDimension;
public ExpandableTitledList() {
setTitle("boom");
// title.layout();
// System.out.println(title.getLayoutBounds().getWidth());
// set down right caret
listItem.setValue(FXCollections.observableArrayList("one", "two"));
Insets theInsets = new Insets(-3, -5, -3, -5);
Border theBorder = new Border(
new BorderStroke(
Color.BLACK,
BorderStrokeStyle.SOLID,
new CornerRadii(4),
new BorderWidths(2),
theInsets
)
);
// expandedDimension = new Dimension2D(200,200);
setBorder(theBorder);
getChildren().addAll(title);
title.setOnMouseClicked((event) -> {
System.out.println("mouse clicked");
if (this.expanded) contract();
else expand();
});
}
@Override
protected void layoutChildren() {
System.out.println(expansionManager.layoutState);
if (expansionManager.layoutState == ExpansionManager.LayoutState.INITIALIZE) {
super.layoutChildren();
expansionManager.layoutState = ExpansionManager.LayoutState.IDLE;
} else if (expansionManager.layoutState == ExpansionManager.LayoutState.ANIMATING) {
super.layoutChildren();
} else if (expansionManager.layoutState == ExpansionManager.LayoutState.REQUEST_ANIMATION) {
setCache(false);
listView.setCache(false);
expansionManager.layoutState = ExpansionManager.LayoutState.ANIMATING;
System.out.println("from : " + expansionManager.fromWidth + ", "+ expansionManager.fromHeight);
System.out.println("to : " + expansionManager.toWidth + ", "+ expansionManager.toHeight);
timeline = new Timeline();
timeline.getKeyFrames().addAll(
new KeyFrame(Duration.ZERO,
new KeyValue(writableHeight, expansionManager.fromHeight),
new KeyValue(writableWidth, expansionManager.fromWidth)),
new KeyFrame(Duration.millis(100),
new KeyValue(writableHeight, expansionManager.toHeight),
new KeyValue(writableWidth, expansionManager.toWidth))
);
timeline.play();
timeline.setOnFinished((done) -> {
System.out.println("done");
expansionManager.layoutState = ExpansionManager.LayoutState.IDLE;
timeline = null;
});
} else {
System.out.println("idle");
super.layoutChildren();
}
}
@Override
protected double computePrefHeight(double width) {
if (expansionManager.layoutState == ExpansionManager.LayoutState.INITIALIZE) {
expansionManager.fromHeight = super.computePrefHeight(width);
return expansionManager.fromHeight;
} else if (expansionManager.layoutState == ExpansionManager.LayoutState.ANIMATING) {
return expansionManager.stepHeight;
} else if (expansionManager.layoutState == ExpansionManager.LayoutState.REQUEST_ANIMATION) {
expansionManager.fromHeight = getHeight();
expansionManager.stepHeight = expansionManager.fromHeight;
expansionManager.toHeight = super.computePrefHeight(width);
return expansionManager.fromHeight;
} else {
return expansionManager.toHeight;
}
}
@Override
protected double computePrefWidth(double height) {
if (expansionManager.layoutState == ExpansionManager.LayoutState.INITIALIZE) {
expansionManager.fromWidth = super.computePrefWidth(height);
return expansionManager.fromWidth;
} else if (expansionManager.layoutState == ExpansionManager.LayoutState.ANIMATING) {
return expansionManager.stepWidth;
} else if (expansionManager.layoutState == ExpansionManager.LayoutState.REQUEST_ANIMATION) {
expansionManager.fromWidth = getWidth();
expansionManager.stepWidth = expansionManager.fromWidth;
expansionManager.toWidth = super.computePrefWidth(height);
return expansionManager.fromWidth;
} else {
System.out.println("BANG BANG BANG");
return expansionManager.toWidth;
}
}
// @Override
// protected double computeMinWidth(double height) {
// return computePrefWidth(height);
// }
//
// @Override
// protected double computeMinHeight(double width) {
// return computePrefHeight(width);
// }
//
// @Override
// protected double computeMaxWidth(double height) {
// return computePrefWidth(height);
// }
//
// @Override
// protected double computeMaxHeight(double width) {
// return computePrefHeight(width);
// }
private void expand() {
System.out.println(expansionManager.layoutState);
// if(contractedDimension == null)
// contractedDimension = new Dimension2D(this.getWidth(), this.getHeight());
// setPrefSize(expandedDimension.getWidth(), expandedDimension.getHeight());
expansionManager.layoutState = ExpansionManager.LayoutState.REQUEST_ANIMATION;
this.getChildren().setAll(title, listView);
expanded = true;
}
private void contract() {
// this.setPrefSize(contractedDimension.getWidth(), contractedDimension.getHeight());
expansionManager.layoutState = ExpansionManager.LayoutState.REQUEST_ANIMATION;
this.getChildren().setAll(title);
expanded = false;
}
public String getTitle() {
return title.getText();
}
public void setTitle(String title) {
this.title.setText(title);
}
}
答案 0 :(得分:1)
我可以发现ListView
是导致故障的原因。
基本上,除了第一次,每次将列表添加到VBox
时,您可以在其容器外部查看完整大小的列表,然后在时间线开始时,它& #39;正确调整大小。
实际上,您可以在时间轴上添加延迟(例如一秒):
timeline.setDelay(Duration.millis(1000));
如果您第二次展开该框,您将看到整秒的问题:
该列表在VBox
之外可见,因为它没有调整大小以适应它。当动画开始时,它会调整大小并且问题就消失了。
我已经尝试了几种方法来调整列表的大小,但没有成功。也许你可以解决它......
每次展开框时,一个丑陋的解决方案是创建列表的新实例:
private void expand() {
expansionManager.layoutState = ExpansionManager.LayoutState.REQUEST_ANIMATION;
// this works...
listView = new ListView<>(listItem);
this.getChildren().setAll(title,listView);
expanded = true;
}
寻找其他替代品,我已将方框disableProperty()
绑定到时间轴,因此您无法在标题列表展开或缩小时点击。
因此,另一个解决方案是将列表visibleProperty()
绑定到时间线,但您不会看到良好的增长效果。
还有第三个解决方案,它也与动画一致:在将列表添加到框之前将不透明度设置为0:
private void expand() {
expansionManager.layoutState = ExpansionManager.LayoutState.REQUEST_ANIMATION;
// this will avoid seeing the unresized listView
listView.setOpacity(0);
this.getChildren().setAll(title,listView);
expanded = true;
}
并添加一个新的KeyValue
,将列表opacityProperty()
从0增加到1到时间轴:
timeline.getKeyFrames().setAll(
new KeyFrame(Duration.ZERO,
new KeyValue(listView.opacityProperty(), 0),
new KeyValue(writableHeight, expansionManager.fromHeight.get()),
new KeyValue(writableWidth, expansionManager.fromWidth.get())),
new KeyFrame(Duration.millis(300),
new KeyValue(listView.opacityProperty(), 1),
new KeyValue(writableHeight, expansionManager.toHeight.get()),
new KeyValue(writableWidth, expansionManager.toWidth.get()))
);
现在你不会看到故障,并且在调整框大小时,列表会很好地显示出来。实际上,我会增加第二个关键帧的持续时间。
修改强>
我还有另一种方法可以避免“故障”。此外,它还可以改善动画,因为当标题列表合同时,列表也会可见。
当您收缩标题列表时,首先删除列表,以便super.computePrefHeight(width)
和super.computePrefWidth(height)
获取小方框的新大小。这有一个明显的缺点,即在下一次扩展时,必须再次添加列表,并发生故障。
为了避免这种情况,我们不会删除该列表。首先,我们在ExpansionManager
上创建了两个新字段:
Double minWidth = 0.0;
Double minHeight = 0.0;
然后我们获得最小尺寸的盒子(在第一次扩展时),并将其用于每次收缩:
@Override
protected double computePrefHeight(double width) {
...
if (expansionManager.layoutState == ExpansionManager.LayoutState.REQUEST_ANIMATION) {
if(expansionManager.minHeight==0d){
expansionManager.minHeight=getHeight();
}
expansionManager.fromHeight = getHeight();
expansionManager.stepHeight = expansionManager.fromHeight;
expansionManager.toHeight = expanded?super.computePrefHeight(width):
expansionManager.minHeight;
return expansionManager.fromHeight;
}
}
@Override
protected double computePrefWidth(double height) {
...
if (expansionManager.layoutState == ExpansionManager.LayoutState.REQUEST_ANIMATION) {
if(expansionManager.minWidth==0d){
expansionManager.minWidth=getWidth();
}
expansionManager.fromWidth = getWidth();
expansionManager.stepWidth = expansionManager.fromWidth;
expansionManager.toWidth = expanded?super.computePrefWidth(height):
expansionManager.minWidth;
return expansionManager.fromWidth;
}
}
最后,我们需要在任何收缩后隐藏列表,否则会看到一个小边框,并更改expand()
和contract()
方法以调用requestLayout()
,因为这个方框不再修改子列表(第一次调用除外):
@Override
protected void layoutChildren() {
timeline.setOnFinished((done) -> {
expansionManager.layoutState = ExpansionManager.LayoutState.IDLE;
listView.setVisible(expanded);
timeline = null;
});
}
private void expand() {
expansionManager.layoutState = ExpansionManager.LayoutState.REQUEST_ANIMATION;
expanded = true;
listView.setVisible(true);
if(this.getChildren().size()==1){
this.getChildren().add(listView);
}
requestLayout();
}
private void contract() {
expansionManager.layoutState = ExpansionManager.LayoutState.REQUEST_ANIMATION;
expanded = false;
requestLayout();
}