asclass ImageSurfaceTool > MouseAdapter { ImageSurface is; Point startingPoint; bool enabled = true; static bool verbose = false; *(ImageSurface is) { register(is); } bool isMouseHandler() { true; } void register(ImageSurface is) { this.is = is; is.removeMouseHandlers(); is.setMouseHandler(this); } void remove() { for (ImageSurfaceSelector s : collectInstances(is.tools, ImageSurfaceSelector)) { is.removeMouseListener(s); is.removeMouseMotionListener(s); is.tools.remove(s); } } public void mousePressed(MouseEvent evt) { if (verbose) print("mousePressed"); if (evt.getButton() != MouseEvent.BUTTON1) return; if (enabled) startingPoint = getPoint(evt); } public void mouseDragged(MouseEvent e) { if (verbose) print("mouseDragged"); if (startingPoint != null) { Point endPoint = getPoint(e); Rectangle r = new Rectangle(startingPoint, new Dimension(endPoint.x-startingPoint.x+1, endPoint.y-startingPoint.y+1)); normalize(r); r.width = min(r.width, is.getImage().getWidth()-r.x); r.height = min(r.height, is.getImage().getHeight()-r.y); is.setSelection(r); } if (verbose) print("mouseDragged done"); } public static void normalize(Rectangle r) { if (r.width < 0) { r.x += r.width; r.width = -r.width; } if (r.height < 0) { r.y += r.height; r.height = -r.height; } } public void mouseReleased(MouseEvent e) { if (verbose) print("mouseReleased"); mouseDragged(e); if (getPoint(e).equals(startingPoint)) is.setSelection((Rectangle) null); startingPoint = null; } Point getPoint(MouseEvent e) { return new Point((int) (e.getX()/is.getZoomX()), (int) (e.getY()/is.getZoomY())); } }
Began life as a copy of #1005517
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Snippet ID: | #1033785 |
Snippet name: | ImageSurfaceTool - a mouse handler for ImageSurface [dev.] |
Eternal ID of this version: | #1033785/1 |
Text MD5: | 8d3554b29126a6d4bbaad195a8d28d85 |
Author: | stefan |
Category: | javax / gui |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2022-01-04 19:53:10 |
Source code size: | 1896 bytes / 71 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 123 / 135 |
Referenced in: | [show references] |