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JavaFX Glitches 动画非标准小部件

转载 作者:塔克拉玛干 更新时间:2023-11-02 20:02:00 28 4
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我正在尝试使用 JavaFX 证明一个可扩展的小部件,它与 TitledPane 的不同之处在于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。

但是我有一个奇怪的故障,在展开/折叠一两次后出现。

这是一个短视频的链接,问题出现在第三次和第四次扩展中:

Short Youtube Concept / Glitch Video

我已经用尽了所有可以尝试让它正常运行的东西。

代码如下,对它的古怪表示歉意,希望在我重构它之前让它工作。

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);
}
}

最佳答案

我发现 ListView 是出现故障的原因。

基本上,除了第一次之外,每次将列表添加到 VBox 时,您都可以在其容器之外的非常短暂的瞬间看到完整大小的列表,然后当时间线开始时,它的大小已适当调整。

事实上,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,您会在整整一秒内看到问题:

Glitch

列表在 VBox 之外是可见的,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,问题就消失了。

那时我已经尝试了几种方法来调整列表的大小,但都没有成功。也许你可以解决它...

一个丑陋的解决方案是在每次展开框时创建一个新的列表实例:

private void expand() {
expansionManager.layoutState = ExpansionManager.LayoutState.REQUEST_ANIMATION;
// this works...
listView = new ListView<>(listItem);
this.getChildren().setAll(title,listView);
expanded = true;
}

寻找其他替代方案,我已将 disableProperty() 框绑定(bind)到时间轴,因此在扩展或收缩带标题的列表时您无法单击。

所以另一种解决方案是将列表 visibleProperty() 绑定(bind)到时间轴,但您不会看到很好的增长效果。

还有第三种解决方案,它也与动画一致:在将列表添加到框中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 增加列表 opacityProperty() 从 0 到 1 到时间线:

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()))
);

现在您不会看到故障,并且在调整框大小时列表会很好地显示。事实上,我会增加第二个关键帧的持续时间。

List resized

编辑

我有另一种方法来避免“故障”。它还可以改进动画效果,因为当标题列表收缩时列表也将可见。

收缩带标题列表时,首先删除列表,因此 super.computePrefHeight(width)super.computePrefWidth(height) 获得新的大小的小盒子。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,并且会发生故障。

为了避免这种情况,我们不会删除该列表。首先,我们在 ExpansionManager 上创建两个新字段:

Double minWidth = 0.0;
Double minHeight = 0.0;

然后我们得到盒子的最小尺寸(在第一次展开时),并在每次收缩时使用它:

@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,我们需要隐藏任何收缩后的列表,否则会看到一个小边框,将expand()contract()方法改为调用requestLayout(),假设框子列表不再被修改(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();
}

关于JavaFX Glitches 动画非标准小部件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27770923/

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