dguihub.core.controls.scrollablecontrol source code

1 /** DGui project file.
2 
3 Copyright: Trogu Antonio Davide 2011-2013
4 
5 License: $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).
6 
7 Authors: Trogu Antonio Davide
8 */
9 module dguihub.core.controls.scrollablecontrol;
10 
11 public import dguihub.core.controls.reflectedcontrol;
12 public import dguihub.core.events.mouseeventargs;
13 public import dguihub.core.events.scrolleventargs;
14 
15 abstract class ScrollableControl : ReflectedControl {
16    public Event!(Control, ScrollEventArgs) scroll;
17    public Event!(Control, MouseWheelEventArgs) mouseWheel;
18 
19    protected final void scrollWindow(ScrollWindowDirection swd, int amount) {
20       this.scrollWindow(swd, amount, nullRect);
21    }
22 
23    protected final void scrollWindow(ScrollWindowDirection swd, int amount, Rect rectScroll) {
24       if (this.created) {
25          switch (swd) {
26          case ScrollWindowDirection.left:
27             ScrollWindowEx(this._handle, amount, 0, null,
28                   rectScroll == nullRect ? null : &rectScroll.rect, null, null, SW_INVALIDATE);
29             break;
30 
31          case ScrollWindowDirection.up:
32             ScrollWindowEx(this._handle, 0, amount, null,
33                   rectScroll == nullRect ? null : &rectScroll.rect, null, null, SW_INVALIDATE);
34             break;
35 
36          case ScrollWindowDirection.right:
37             ScrollWindowEx(this._handle, -amount, 0, null,
38                   rectScroll == nullRect ? null : &rectScroll.rect, null, null, SW_INVALIDATE);
39             break;
40 
41          case ScrollWindowDirection.down:
42             ScrollWindowEx(this._handle, 0, -amount, null,
43                   rectScroll == nullRect ? null : &rectScroll.rect, null, null, SW_INVALIDATE);
44             break;
45 
46          default:
47             break;
48          }
49       }
50    }
51 
52    protected void onMouseWheel(MouseWheelEventArgs e) {
53       this.mouseWheel(this, e);
54    }
55 
56    protected void onScroll(ScrollEventArgs e) {
57       this.scroll(this, e);
58    }
59 
60    protected override void wndProc(ref Message m) {
61       switch (m.msg) {
62       case WM_MOUSEWHEEL: {
63             short delta = GetWheelDelta(m.wParam);
64             scope MouseWheelEventArgs e = new MouseWheelEventArgs(Point(LOWORD(m.lParam),
65                   HIWORD(m.lParam)), cast(MouseKeys)m.wParam, delta > 0
66                   ? MouseWheel.up : MouseWheel.down);
67             this.onMouseWheel(e);
68             this.originalWndProc(m);
69          }
70          break;
71 
72       case WM_VSCROLL, WM_HSCROLL: {
73             ScrollDirection sd = m.msg == WM_VSCROLL ? ScrollDirection.vertical
74                : ScrollDirection.horizontal;
75             ScrollMode sm = cast(ScrollMode)m.wParam;
76 
77             scope ScrollEventArgs e = new ScrollEventArgs(sd, sm);
78             this.onScroll(e);
79 
80             this.originalWndProc(m);
81          }
82          break;
83 
84       default:
85          break;
86       }
87 
88       super.wndProc(m);
89    }
90 }