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Allow user to resize an undecorated Stage

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悲&欢浪女
悲&欢浪女 2020-12-24 02:21

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.

I m

12条回答
  • 北荒
    北荒 (楼主)
    2020-12-24 03:08

    I updated @Yevhenii.Kanivets ' updated version of @Alexander.Berg 's ResizeHelper class. This includes the ability to drag the scene, with the best implementation I've found of ResizeHelper. Also set minimum stage size to a height of 1 and width of 1 instead of 0, because there are bugs if they stay at 0.

    Someone still can improve on this answer. The SW, W, NW, N, and NE edges do not resize smoothly, although it's a minor issue. When resizing from those edges, the scene also can shift slightly. They should resize smoothly like the S, SE, and E edges do. The latter edges do not shift the scene.

    1. @Cripperz 's implementation with dragging was still buggy.
    2. @Alessandro Roaro same issue as above.
    3. @Valeriy Blyus same issue as above.
    4. @Joseph Adomatis 's implementation is not generic.

    I cannot speak for @M.K 's implementation as I am not using Kotlin, but I'd give that a shot first if you are.

    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;

/**
 * Util class to handle window resizing when a stage style set to StageStyle.UNDECORATED.
 * Includes dragging of the stage.
 * Original on 6/13/14.
 * Updated on 8/15/17.
 * Updated on 12/19/19.
 *
 * @author Alexander.Berg
 * @author Evgenii Kanivets
 * @author Zachary Perales
 */

public class ResizeHelper {

    public static void addResizeListener(Stage stage) {
        addResizeListener(stage, 1, 1, Double.MAX_VALUE, Double.MAX_VALUE);
    }

    public static void addResizeListener(Stage stage, double minWidth, double minHeight, double maxWidth, double maxHeight) {
        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);

        resizeListener.setMinWidth(minWidth);
        resizeListener.setMinHeight(minHeight);
        resizeListener.setMaxWidth(maxWidth);
        resizeListener.setMaxHeight(maxHeight);

        ObservableList children = stage.getScene().getRoot().getChildrenUnmodifiable();
        for (Node child : children) {
            addListenerDeeply(child, resizeListener);
        }
    }

    private static void addListenerDeeply(Node node, EventHandler 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 children = parent.getChildrenUnmodifiable();
            for (Node child : children) {
                addListenerDeeply(child, listener);
            }
        }
    }

    static class ResizeListener implements EventHandler {
        private Stage stage;
        private Cursor cursorEvent = Cursor.DEFAULT;
        private boolean resizing = true;
        private int border = 4;
        private double startX = 0;
        private double startY = 0;
        private double screenOffsetX = 0;
        private double screenOffsetY = 0;

        // Max and min sizes for controlled stage
        private double minWidth;
        private double maxWidth;
        private double minHeight;
        private double maxHeight;

        public ResizeListener(Stage stage) {
            this.stage = stage;
        }

        public void setMinWidth(double minWidth) {
            this.minWidth = minWidth;
        }

        public void setMaxWidth(double maxWidth) {
            this.maxWidth = maxWidth;
        }

        public void setMinHeight(double minHeight) {
            this.minHeight = minHeight;
        }

        public void setMaxHeight(double maxHeight) {
            this.maxHeight = maxHeight;
        }

        @Override
        public void handle(MouseEvent mouseEvent) {
            EventType 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)) {
                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)) {
                startX = stage.getWidth() - mouseEventX;
                startY = stage.getHeight() - mouseEventY;
            } else if (MouseEvent.MOUSE_DRAGGED.equals(mouseEventType)) {
                if (!Cursor.DEFAULT.equals(cursorEvent)) {
                    resizing = true;
                    if (!Cursor.W_RESIZE.equals(cursorEvent) && !Cursor.E_RESIZE.equals(cursorEvent)) {
                        double minHeight = stage.getMinHeight() > (border * 2) ? stage.getMinHeight() : (border * 2);
                        if (Cursor.NW_RESIZE.equals(cursorEvent) || Cursor.N_RESIZE.equals(cursorEvent)
                                || Cursor.NE_RESIZE.equals(cursorEvent)) {
                            if (stage.getHeight() > minHeight || mouseEventY < 0) {
                                setStageHeight(stage.getY() - mouseEvent.getScreenY() + stage.getHeight());
                                stage.setY(mouseEvent.getScreenY() );
                            }
                        } else {
                            if (stage.getHeight() > minHeight || mouseEventY + startY - stage.getHeight() > 0) {
                                setStageHeight(mouseEventY + startY);
                            }
                        }
                    }

                    if (!Cursor.N_RESIZE.equals(cursorEvent) && !Cursor.S_RESIZE.equals(cursorEvent)) {
                        double minWidth = stage.getMinWidth() > (border * 2) ? stage.getMinWidth() : (border * 2);
                        if (Cursor.NW_RESIZE.equals(cursorEvent) || Cursor.W_RESIZE.equals(cursorEvent)
                                || Cursor.SW_RESIZE.equals(cursorEvent)) {
                            if (stage.getWidth() > minWidth || mouseEventX < 0) {
                                setStageWidth(stage.getX() - mouseEvent.getScreenX() + stage.getWidth());
                                stage.setX(mouseEvent.getScreenX());
                            }
                        } else {
                            if (stage.getWidth() > minWidth || mouseEventX + startX - stage.getWidth() > 0) {
                                setStageWidth(mouseEventX + startX);
                            }
                        }
                    }
                    resizing = false;
                }
            }

            if (MouseEvent.MOUSE_PRESSED.equals(mouseEventType) && Cursor.DEFAULT.equals(cursorEvent)) {
                resizing = false;
                screenOffsetX = stage.getX() - mouseEvent.getScreenX();
                screenOffsetY = stage.getY() - mouseEvent.getScreenY();
            }

            if (MouseEvent.MOUSE_DRAGGED.equals(mouseEventType) && Cursor.DEFAULT.equals(cursorEvent) && resizing == false) {
                stage.setX(mouseEvent.getScreenX() + screenOffsetX);
                stage.setY(mouseEvent.getScreenY() + screenOffsetY);
            }

        }

        private void setStageWidth(double width) {
            width = Math.min(width, maxWidth);
            width = Math.max(width, minWidth);
            stage.setWidth(width);
        }

        private void setStageHeight(double height) {
            height = Math.min(height, maxHeight);
            height = Math.max(height, minHeight);
            stage.setHeight(height);
        }

    }
}

    Edit:

    I've updated this code to not drag any scrollbars, as nobody wants that functionality and I needed to remove it myself. It should be easy to disallow additional controls from being dragged if you come across the need, by comparing my two code submissions on here.

    Note that if the disallowed control is on the edge of the scene, you need to wrap it in something draggable to access resizing on those edges. 

    public class ResizeHelper {
    static boolean isScrollbar = false;

    public static void addResizeListener(Stage stage) {
        addResizeListener(stage, 1, 1, Double.MAX_VALUE, Double.MAX_VALUE);
    }

    public static void addResizeListener(Stage stage, double minWidth, double minHeight, double maxWidth, double maxHeight) {
        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);

        resizeListener.setMinWidth(minWidth);
        resizeListener.setMinHeight(minHeight);
        resizeListener.setMaxWidth(maxWidth);
        resizeListener.setMaxHeight(maxHeight);


        ObservableList children = stage.getScene().getRoot().getChildrenUnmodifiable();
        for (Node child : children) {
            if (child instanceof ScrollBar) {
                isScrollbar = true;
            } else if (!(child instanceof ScrollBar)) {
                isScrollbar = false;
                addListenerDeeply(child, resizeListener);
            }
        }
    }

    private static void addListenerDeeply(Node node, EventHandler 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 children = parent.getChildrenUnmodifiable();
            for (Node child : children) {
                if (child instanceof ScrollBar) {
                    isScrollbar = true;
                } else if (!(child instanceof ScrollBar)) {
                    isScrollbar = false;
                    addListenerDeeply(child, listener);
                }
            }
        }
    }

    static class ResizeListener implements EventHandler {
        private Stage stage;
        private Cursor cursorEvent = Cursor.DEFAULT;
        private boolean resizing = true;
        private int border = 4;
        private double startX = 0;
        private double startY = 0;
        private double screenOffsetX = 0;
        private double screenOffsetY = 0;

        // Max and min sizes for controlled stage
        private double minWidth;
        private double maxWidth;
        private double minHeight;
        private double maxHeight;

        public ResizeListener(Stage stage) {
            this.stage = stage;
        }

        public void setMinWidth(double minWidth) {
            this.minWidth = minWidth;
        }

        public void setMaxWidth(double maxWidth) {
            this.maxWidth = maxWidth;
        }

        public void setMinHeight(double minHeight) {
            this.minHeight = minHeight;
        }

        public void setMaxHeight(double maxHeight) {
            this.maxHeight = maxHeight;
        }

        @Override
        public void handle(MouseEvent mouseEvent) {
            EventType 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) && stage.isMaximized() == false ) {
                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)) {
                startX = stage.getWidth() - mouseEventX;
                startY = stage.getHeight() - mouseEventY;
            } else if (MouseEvent.MOUSE_DRAGGED.equals(mouseEventType)) {
                if (!Cursor.DEFAULT.equals(cursorEvent)) {
                    resizing = true;
                    if (!Cursor.W_RESIZE.equals(cursorEvent) && !Cursor.E_RESIZE.equals(cursorEvent)) {
                        double minHeight = stage.getMinHeight() > (border * 2) ? stage.getMinHeight() : (border * 2);
                        if (Cursor.NW_RESIZE.equals(cursorEvent) || Cursor.N_RESIZE.equals(cursorEvent)
                                || Cursor.NE_RESIZE.equals(cursorEvent)) {
                            if (stage.getHeight() > minHeight || mouseEventY < 0) {
                                setStageHeight(stage.getY() - mouseEvent.getScreenY() + stage.getHeight());
                                stage.setY(mouseEvent.getScreenY() );
                            }
                        } else {
                            if (stage.getHeight() > minHeight || mouseEventY + startY - stage.getHeight() > 0) {
                                setStageHeight(mouseEventY + startY);
                            }
                        }
                    }

                    if (!Cursor.N_RESIZE.equals(cursorEvent) && !Cursor.S_RESIZE.equals(cursorEvent)) {
                        double minWidth = stage.getMinWidth() > (border * 2) ? stage.getMinWidth() : (border * 2);
                        if (Cursor.NW_RESIZE.equals(cursorEvent) || Cursor.W_RESIZE.equals(cursorEvent)
                                || Cursor.SW_RESIZE.equals(cursorEvent)) {
                            if (stage.getWidth() > minWidth || mouseEventX < 0) {
                                setStageWidth(stage.getX() - mouseEvent.getScreenX() + stage.getWidth());
                                stage.setX(mouseEvent.getScreenX());
                            }
                        } else {
                            if (stage.getWidth() > minWidth || mouseEventX + startX - stage.getWidth() > 0) {
                                setStageWidth(mouseEventX + startX);
                            }
                        }
                    }
                    resizing = false;
                }
            }

            if (MouseEvent.MOUSE_PRESSED.equals(mouseEventType) && Cursor.DEFAULT.equals(cursorEvent) ) {
                resizing = false;
                screenOffsetX = stage.getX() - mouseEvent.getScreenX();
                screenOffsetY = stage.getY() - mouseEvent.getScreenY();

            }

            if (MouseEvent.MOUSE_DRAGGED.equals(mouseEventType) && Cursor.DEFAULT.equals(cursorEvent) && resizing == false) {
                stage.setX(mouseEvent.getScreenX() + screenOffsetX);
                stage.setY(mouseEvent.getScreenY() + screenOffsetY);

            }

        }

        private void setStageWidth(double width) {
            width = Math.min(width, maxWidth);
            width = Math.max(width, minWidth);
            stage.setWidth(width);
        }

        private void setStageHeight(double height) {
            height = Math.min(height, maxHeight);
            height = Math.max(height, minHeight);
            stage.setHeight(height);
        }

    }

}

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