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1 | sclass ImageSurfaceDragger extends ImageSurfaceMouseHandler {
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2 | sbool debug = true; |
3 | Point start, startScroll; |
4 | int dx, dy; |
5 | |
6 | *() {}
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7 | *(ImageSurface is) {
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8 | if (containsInstance(is.tools, ImageSurfaceDragger)) ret; |
9 | this.register(is); |
10 | } |
11 | |
12 | public void mousePressed(MouseEvent e) {
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13 | JScrollPane sp = enclosingScrollPane(is); |
14 | if (sp == null) ret; |
15 | if (e.getButton() == MouseEvent.BUTTON1) {
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16 | start = e.getLocationOnScreen(); |
17 | startScroll = new Point( |
18 | scrollBarValue(sp.getHorizontalScrollBar()), |
19 | scrollBarValue(sp.getVerticalScrollBar())); |
20 | } |
21 | } |
22 | |
23 | public void mouseDragged(MouseEvent e) {
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24 | if (start == null) ret; |
25 | JScrollPane sp = enclosingScrollPane(is); |
26 | if (sp == null) ret; |
27 | Point p = e.getLocationOnScreen(); |
28 | //if (debug) print("ImageSurfaceDragger: drag " + p.x + "/" + p.y);
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29 | setScrollBarValue(sp.getHorizontalScrollBar(), -(p.x-start.x)+startScroll.x); |
30 | setScrollBarValue(sp.getVerticalScrollBar(), -(p.y-start.y)+startScroll.y); |
31 | } |
32 | |
33 | public void mouseReleased(MouseEvent e) {
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34 | mouseDragged(e); |
35 | start = null; |
36 | } |
37 | } |
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| Snippet ID: | #1008773 |
| Snippet name: | ImageSurfaceDragger - scrolls by dragging |
| Eternal ID of this version: | #1008773/23 |
| Text MD5: | 1a66c7513256b0efb7a9187e7af3e600 |
| Transpilation MD5: | b365b4772f11188009f414160ad29994 |
| Author: | stefan |
| Category: | javax / gui |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2022-02-15 22:29:23 |
| Source code size: | 1140 bytes / 37 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 577 / 1295 |
| Version history: | 22 change(s) |
| Referenced in: | [show references] |