JavaFx中Controller獲取Stage並自定義窗口移動與縮放邏輯
由於去掉了平臺自帶了標題欄，窗口就無法移動和縮放了，需要我們自己來實現。
去除窗口標題欄
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));
primaryStage.setTitle("main");
// 主要是這一句
primaryStage.initStyle(StageStyle.TRANSPARENT);
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}在Controller中獲取Stage
首先確定在Controller中獲取到你的跟佈局對象，如下：
public class Controller implements Initializable {
public BorderPane root;
private Stage stage;
}<BorderPane fx:id="root" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" stylesheets="@../css/main.css" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="line.main.Controller">
<!--其他佈局元素-->
</BorderPane>然後可以在public void initialize(URL url, ResourceBundle resourceBundle) 方法內獲取Stage
public class Controller implements Initializable {
public BorderPane root;
private Stage stage;
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
var stage = getStage();
}
private Stage getStage() {
if (stage == null) {
stage = (Stage) root.getScene().getWindow();
}
return stage;
}
}自定義窗體移動與縮放邏輯
-
記錄鼠標座標
root.setOnMousePressed(event -> { event.consume(); xOffset = event.getSceneX(); yOffset = event.getSceneY(); }); -
自定義移動控制區域
dragArea.setOnMouseDragged(event -> { event.consume(); var stage = getStage(); stage.setX(event.getScreenX() - xOffset); stage.setY(event.getScreenY() - yOffset); }); -
判斷鼠標座標位置，並處理光標變換
root.setOnMouseMoved(this::mouseMoveHandle); private void mouseMoveHandle(MouseEvent event) { event.consume(); double x = event.getSceneX(); double y = event.getSceneY(); var stage = getStage(); double width = stage.getWidth(); double height = stage.getHeight(); Cursor cursorType = Cursor.DEFAULT; bit = 0; if (y >= height - RESIZE_WIDTH) { if (x <= RESIZE_WIDTH) { bit |= 1 << 3; } else if (x >= width - RESIZE_WIDTH) { bit |= 1; bit |= 1 << 2; cursorType = Cursor.SE_RESIZE; } else { bit |= 1; cursorType = Cursor.S_RESIZE; } } else if (x >= width - RESIZE_WIDTH) { bit |= 1 << 2; cursorType = Cursor.E_RESIZE; } root.setCursor(cursorType); } -
處理窗口縮放
root.setOnMouseDragged(this::mouseDraggedHandle); private void mouseDraggedHandle(MouseEvent event) { event.consume(); var primaryStage = getStage(); double x = event.getSceneX(); double y = event.getSceneY(); double nextX = primaryStage.getX(); double nextY = primaryStage.getY(); double nextWidth = primaryStage.getWidth(); double nextHeight = primaryStage.getHeight(); if ((bit & 1 << 2) != 0) { nextWidth = x; } if ((bit & 1) != 0) { nextHeight = y; } if (nextWidth <= MIN_WIDTH) { nextWidth = MIN_WIDTH; } if (nextHeight <= MIN_HEIGHT) { nextHeight = MIN_HEIGHT; } primaryStage.setX(nextX); primaryStage.setY(nextY); primaryStage.setWidth(nextWidth); primaryStage.setHeight(nextHeight); }
完整代碼
package line.main;
import javafx.fxml.Initializable;
import javafx.scene.Cursor;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
import java.net.URL;
import java.util.ResourceBundle;
public class Controller implements Initializable {
public BorderPane root;
public Pane dragArea;
private Stage stage;
private double xOffset = 0;
private double yOffset = 0;
private int bit = 0;//left,right,top,bottom
private static final double RESIZE_WIDTH = 5.00;
private static final double MIN_WIDTH = 600.00;
private static final double MIN_HEIGHT = 400.00;
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
dragArea.setOnMouseDragged(event -> {
event.consume();
var stage = getStage();
stage.setX(event.getScreenX() - xOffset);
stage.setY(event.getScreenY() - yOffset);
});
root.setOnMousePressed(event -> {
event.consume();
xOffset = event.getSceneX();
yOffset = event.getSceneY();
});
root.setOnMouseMoved(this::mouseMoveHandle);
root.setOnMouseDragged(this::mouseDraggedHandle);
}
private Stage getStage() {
if (stage == null) {
stage = (Stage) root.getScene().getWindow();
}
return stage;
}
private void mouseMoveHandle(MouseEvent event) {
event.consume();
double x = event.getSceneX();
double y = event.getSceneY();
var stage = getStage();
double width = stage.getWidth();
double height = stage.getHeight();
Cursor cursorType = Cursor.DEFAULT;
bit = 0;
if (y >= height - RESIZE_WIDTH) {
if (x <= RESIZE_WIDTH) {
bit |= 1 << 3;
} else if (x >= width - RESIZE_WIDTH) {
bit |= 1;
bit |= 1 << 2;
cursorType = Cursor.SE_RESIZE;
} else {
bit |= 1;
cursorType = Cursor.S_RESIZE;
}
} else if (x >= width - RESIZE_WIDTH) {
bit |= 1 << 2;
cursorType = Cursor.E_RESIZE;
}
root.setCursor(cursorType);
}
private void mouseDraggedHandle(MouseEvent event) {
event.consume();
var primaryStage = getStage();
double x = event.getSceneX();
double y = event.getSceneY();
double nextX = primaryStage.getX();
double nextY = primaryStage.getY();
double nextWidth = primaryStage.getWidth();
double nextHeight = primaryStage.getHeight();
if ((bit & 1 << 2) != 0) {
nextWidth = x;
}
if ((bit & 1) != 0) {
nextHeight = y;
}
if (nextWidth <= MIN_WIDTH) {
nextWidth = MIN_WIDTH;
}
if (nextHeight <= MIN_HEIGHT) {
nextHeight = MIN_HEIGHT;
}
primaryStage.setX(nextX);
primaryStage.setY(nextY);
primaryStage.setWidth(nextWidth);
primaryStage.setHeight(nextHeight);
}
}