94 lines
2.5 KiB
Text
94 lines
2.5 KiB
Text
gui.widgets.ScrollArea = {
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new: func(parent, style, cfg)
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{
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var cfg = Config.new(cfg);
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var m = gui.Widget.new(gui.widgets.ScrollArea);
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m._focus_policy = m.StrongFocus;
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m._active = 0;
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m._pos = [0,0];
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m._size = cfg.get("size", m._size);
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if( style != nil )
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{
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m._scroll = style.createWidget(parent, "scroll-area", cfg);
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m._setRoot(m._scroll.element);
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m._scroll.vert.addEventListener("mousedown", func(e) m._dragStart(e));
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m._scroll.horiz.addEventListener("mousedown", func(e) m._dragStart(e));
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m._scroll.vert.addEventListener
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(
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"drag",
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func(e) m.moveTo(m._pos[0], m._drag_offsetY + e.clientY)
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);
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m._scroll.horiz.addEventListener
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(
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"drag",
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func(e) m.moveTo(m._drag_offsetX + e.clientX, m._pos[1])
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);
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}
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return m;
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},
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getContent: func()
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{
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return me._scroll.content;
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},
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moveTo: func(x, y)
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{
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me._pos[0] = math.max(0, math.min(x, me._max_scroll[0]));
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me._pos[1] = math.max(0, math.min(y, me._max_scroll[1]));
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me.update();
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},
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update: func()
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{
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# TODO only update on content resize
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var bb = me.getContent().getTransformedBounds();
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if( bb[2] < bb[0] or bb[3] < bb[1] )
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# Do nothing with invalid bounding box (probably no content yet)
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return me;
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var w = bb[2] - bb[0];
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var h = bb[3] - bb[1];
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me._max_scroll = [0, 0];
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if( w > me._size[0] )
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me._max_scroll[0] = me._size[0] * (1 - me._size[0] / w);
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if( h > me._size[1] )
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me._max_scroll[1] = me._size[1] * (1 - me._size[1] / h);
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me._content_size = [w, h];
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var cur_offset = me.getContent().getTranslation();
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me._content_offset = [cur_offset[0] - bb[0], cur_offset[1] - bb[1]];
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var offset = [ me._content_offset[0],
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me._content_offset[1] ];
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if( me._max_scroll[0] > 1 )
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offset[0] -= (me._pos[0] / me._max_scroll[0])
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* (me._content_size[0] - me._size[0]);
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if( me._max_scroll[1] > 1 )
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offset[1] -= (me._pos[1] / me._max_scroll[1])
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* (me._content_size[1] - me._size[1]);
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me.getContent().setTranslation(offset);
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me._scroll.update(me);
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me.getContent().update();
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},
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# protected:
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_setRoot: func(el)
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{
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el.addEventListener("wheel", func(e) me.moveTo(me._pos[0], me._pos[1] - e.deltaY));
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call(gui.Widget._setRoot, [el], me);
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},
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_dragStart: func(e)
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{
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me._drag_offsetX = me._pos[0] - e.clientX;
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me._drag_offsetY = me._pos[1] - e.clientY;
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}
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};
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