soundtab.ui.pitchwidget source code

1 module soundtab.ui.pitchwidget;
2 
3 import dlangui.widgets.widget;
4 import soundtab.ui.noteutil;
5 
6 class PitchWidget : Widget {
7 
8     double _currentPitch = 478;
9 
10     this() {
11         super("pitch");
12         styleId = "EDIT_LINE";
13         margins = Rect(5,5,5,5).pointsToPixels;
14     }
15 
16     /** 
17     Measure widget according to desired width and height constraints. (Step 1 of two phase layout). 
18     */
19     override void measure(int parentWidth, int parentHeight) {
20         int h = font.height * 150 / 100;
21         measuredContent(parentWidth, parentHeight, parentWidth / 5, h);
22     }
23 
24     /// Draw widget at its position to buffer
25     override void onDraw(DrawBuf buf) {
26         if (visibility != Visibility.Visible)
27             return;
28         Rect rc = _pos;
29         applyMargins(rc);
30         auto saver = ClipRectSaver(buf, rc, alpha);
31         DrawableRef bg = backgroundDrawable;
32         if (!bg.isNull) {
33             bg.drawTo(buf, rc, state);
34         }
35         applyPadding(rc);
36         _needDraw = false;
37 
38         buf.fillRect(Rect(rc.middlex, rc.top, rc.middlex + 1, rc.top + rc.height / 3), 0x00C000);
39         buf.fillRect(Rect(rc.middlex, rc.bottom - rc.height / 3, rc.middlex + 1, rc.bottom), 0x00C000);
40 
41         if (_currentPitch < 8 || _currentPitch > 20000)
42             return; // no note
43         double currentNote = toLogScale(_currentPitch);
44         int intNote = getNearestNote(currentNote);
45         double noteDiff = currentNote - intNote;
46         dstring noteName = noteToFullName(currentNote);
47         FontRef fnt = font;
48         Point sz = fnt.textSize(noteName);
49         fnt.drawText(buf, rc.middlex - sz.x / 2, rc.middley - sz.y/2, noteName, 0x8090A0);
50 
51         int x = cast(int)(rc.left + rc.width * (noteDiff + 0.5));
52         buf.fillRect(Rect(x, rc.top, x+1, rc.bottom), 0x40FF0000);
53 
54         // draw frequency
55         import std..string : format;
56         import std.utf : toUTF32;
57         dstring freq = "%.2fHz".format(_currentPitch).toUTF32;
58         fnt.drawText(buf, rc.left, rc.middley - sz.y/2, freq, 0x808080);
59     }
60 
61     void setPitch(double freq) {
62         _currentPitch = freq;
63         invalidate();
64     }
65 
66 
67 }
68