允许用户调整未修饰的舞台的大小

本文介绍了允许用户调整未修饰的舞台的大小的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用JavaFX制作屏幕录像机，并且屏幕录像机中必须使用的一个实用程序是让用户定义要记录的区域。

I am working on making a screen recorder in JavaFX and one utility that is mandatory in the screen recorder is to let the user define how much area to record.

我设法做了一个未修饰的，半透明的 Stage ，可以拖动它来定义区域并添加一个关闭按钮，让用户确认要记录的区域。

I managed to make an undecorated , semi-transparent Stage that can be dragged around to define the area and added a close button to let the user confirm the area which is to be recorded.

现在，如何让用户通过拖动边缘来调整舞台大小？

SSCCE：

package draggable; import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.Pos; import javafx.geometry.Rectangle2D; import javafx.scene.Scene; import javafx.scene.SceneBuilder; import javafx.scene.control.Button; import javafx.scene.control.ButtonBuilder; import javafx.scene.input.MouseEvent; import javafx.scene.layout.StackPane; import javafx.scene.layout.StackPaneBuilder; import javafx.scene.paint.Color; import javafx.stage.Screen; import javafx.stage.Stage; import javafx.stage.StageStyle; public class DraggableStage extends Application{ Button close; StackPane holder; Rectangle2D maxBounds; Scene theScene; double pressedX; double pressedY; double draggedX; double draggedY; @Override public void start(Stage stage) throws Exception { final Stage theStage = stage; // determine how big the screen is maxBounds = Screen.getPrimary().getVisualBounds(); //create the close button close = ButtonBuilder .create() .text("Close") .build(); //create the StackPane holder for the button holder = StackPaneBuilder .create() .alignment(Pos.CENTER) .children(close) .build(); // you cannot resize the screen beyond the max resolution of the screen holder.setMaxSize(maxBounds.getWidth(), maxBounds.getHeight()); //you cannot resize under half the width and height of the screen holder.setMinSize(maxBounds.getWidth() / 2,maxBounds.getHeight() / 2); //the scene where it all happens theScene = SceneBuilder .create() .root(holder) .width(maxBounds.getWidth() / 2) .height(maxBounds.getHeight() / 2) .build(); // add the button listeners close.setOnAction(new EventHandler<ActionEvent>(){ @Override public void handle(ActionEvent event) { theStage.close(); } }); // add the drag and press listener for the StackPane holder.setOnMousePressed(new EventHandler<MouseEvent>(){ @Override public void handle(MouseEvent e) { pressedX = e.getX(); pressedY = e.getY(); } }); holder.setOnMouseDragged(new EventHandler<MouseEvent>(){ @Override public void handle(MouseEvent e) { draggedX = e.getX(); draggedY = e.getY(); double differenceX = draggedX - pressedX; double differenceY = draggedY - pressedY; theStage.setX(theStage.getX() + differenceX); theStage.setY(theStage.getY() + differenceY); } }); //the mandatory mumbo jumbo theScene.setFill(Color.rgb(128, 128, 128, 0.5)); stage.initStyle(StageStyle.TRANSPARENT); stage.setScene(theScene); stage.sizeToScene(); stage.show(); } public static void main(String[] args) { Application.launch("draggable.DraggableStage"); } }

图片：

Image:

推荐答案

我创建了一个ResizeHelper类，在这种情况下可以帮助你，用法：

I created a ResizeHelper class which can help you in that case, usage:

ResizeHelper.addResizeListener(yourStage);

帮助程序类：

import javafx.collections.ObservableList; import javafx.event.EventHandler; import javafx.event.EventType; import javafx.scene.Cursor; import javafx.scene.Node; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.input.MouseEvent; import javafx.stage.Stage; //created by Alexander Berg public class ResizeHelper { public static void addResizeListener(Stage stage) { ResizeListener resizeListener = new ResizeListener(stage); stage.getScene().addEventHandler(MouseEvent.MOUSE_MOVED, resizeListener); stage.getScene().addEventHandler(MouseEvent.MOUSE_PRESSED, resizeListener); stage.getScene().addEventHandler(MouseEvent.MOUSE_DRAGGED, resizeListener); stage.getScene().addEventHandler(MouseEvent.MOUSE_EXITED, resizeListener); stage.getScene().addEventHandler(MouseEvent.MOUSE_EXITED_TARGET, resizeListener); ObservableList<Node> children = stage.getScene().getRoot().getChildrenUnmodifiable(); for (Node child : children) { addListenerDeeply(child, resizeListener); } } public static void addListenerDeeply(Node node, EventHandler<MouseEvent> listener) { node.addEventHandler(MouseEvent.MOUSE_MOVED, listener); node.addEventHandler(MouseEvent.MOUSE_PRESSED, listener); node.addEventHandler(MouseEvent.MOUSE_DRAGGED, listener); node.addEventHandler(MouseEvent.MOUSE_EXITED, listener); node.addEventHandler(MouseEvent.MOUSE_EXITED_TARGET, listener); if (node instanceof Parent) { Parent parent = (Parent) node; ObservableList<Node> children = parent.getChildrenUnmodifiable(); for (Node child : children) { addListenerDeeply(child, listener); } } } static class ResizeListener implements EventHandler<MouseEvent> { private Stage stage; private Cursor cursorEvent = Cursor.DEFAULT; private int border = 4; private double startX = 0; private double startY = 0; public ResizeListener(Stage stage) { this.stage = stage; } @Override public void handle(MouseEvent mouseEvent) { EventType<? extends MouseEvent> mouseEventType = mouseEvent.getEventType(); Scene scene = stage.getScene(); double mouseEventX = mouseEvent.getSceneX(), mouseEventY = mouseEvent.getSceneY(), sceneWidth = scene.getWidth(), sceneHeight = scene.getHeight(); if (MouseEvent.MOUSE_MOVED.equals(mouseEventType) == true) { if (mouseEventX < border && mouseEventY < border) { cursorEvent = Cursor.NW_RESIZE; } else if (mouseEventX < border && mouseEventY > sceneHeight - border) { cursorEvent = Cursor.SW_RESIZE; } else if (mouseEventX > sceneWidth - border && mouseEventY < border) { cursorEvent = Cursor.NE_RESIZE; } else if (mouseEventX > sceneWidth - border && mouseEventY > sceneHeight - border) { cursorEvent = Cursor.SE_RESIZE; } else if (mouseEventX < border) { cursorEvent = Cursor.W_RESIZE; } else if (mouseEventX > sceneWidth - border) { cursorEvent = Cursor.E_RESIZE; } else if (mouseEventY < border) { cursorEvent = Cursor.N_RESIZE; } else if (mouseEventY > sceneHeight - border) { cursorEvent = Cursor.S_RESIZE; } else { cursorEvent = Cursor.DEFAULT; } scene.setCursor(cursorEvent); } else if(MouseEvent.MOUSE_EXITED.equals(mouseEventType) || MouseEvent.MOUSE_EXITED_TARGET.equals(mouseEventType)){ scene.setCursor(Cursor.DEFAULT); } else if (MouseEvent.MOUSE_PRESSED.equals(mouseEventType) == true) { startX = stage.getWidth() - mouseEventX; startY = stage.getHeight() - mouseEventY; } else if (MouseEvent.MOUSE_DRAGGED.equals(mouseEventType) == true) { if (Cursor.DEFAULT.equals(cursorEvent) == false) { if (Cursor.W_RESIZE.equals(cursorEvent) == false && Cursor.E_RESIZE.equals(cursorEvent) == false) { double minHeight = stage.getMinHeight() > (border*2) ? stage.getMinHeight() : (border*2); if (Cursor.NW_RESIZE.equals(cursorEvent) == true || Cursor.N_RESIZE.equals(cursorEvent) == true || Cursor.NE_RESIZE.equals(cursorEvent) == true) { if (stage.getHeight() > minHeight || mouseEventY < 0) { stage.setHeight(stage.getY() - mouseEvent.getScreenY() + stage.getHeight()); stage.setY(mouseEvent.getScreenY()); } } else { if (stage.getHeight() > minHeight || mouseEventY + startY - stage.getHeight() > 0) { stage.setHeight(mouseEventY + startY); } } } if (Cursor.N_RESIZE.equals(cursorEvent) == false && Cursor.S_RESIZE.equals(cursorEvent) == false) { double minWidth = stage.getMinWidth() > (border*2) ? stage.getMinWidth() : (border*2); if (Cursor.NW_RESIZE.equals(cursorEvent) == true || Cursor.W_RESIZE.equals(cursorEvent) == true || Cursor.SW_RESIZE.equals(cursorEvent) == true) { if (stage.getWidth() > minWidth || mouseEventX < 0) { stage.setWidth(stage.getX() - mouseEvent.getScreenX() + stage.getWidth()); stage.setX(mouseEvent.getScreenX()); } } else { if (stage.getWidth() > minWidth || mouseEventX + startX - stage.getWidth() > 0) { stage.setWidth(mouseEventX + startX); } } } } } } } }