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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Drawing; | ||
| using System.Runtime.InteropServices; | ||
| using System.Windows.Forms; | ||
|
|
||
| namespace Opulos.Core.UI | ||
| { | ||
| //https://stackoverflow.com/questions/29083903/contextmenustrip-scroll-up-or-down-button | ||
| ///<summary>Extension class to increase the size of the scroll up-down arrows on a drop down context menu or tool strip menu. The default up-down arrows are only 5 pixels high.</summary> | ||
| public static class ToolStripEx | ||
| { | ||
| public delegate void Action(); | ||
| private static Hashtable htData = new Hashtable(); | ||
|
|
||
| private class Data | ||
| { | ||
| public bool needsUpdate = true; | ||
| public bool disposeLastImage = false; | ||
| public ToolStrip toolStrip = null; | ||
| public List<Image> currentImages = new List<Image>(); | ||
| } | ||
|
|
||
| public static void BigButtons(ToolStrip toolStrip) | ||
| { | ||
| htData[toolStrip] = new Data() { toolStrip = toolStrip }; | ||
| toolStrip.VisibleChanged += toolStrip_VisibleChanged; | ||
| toolStrip.ForeColorChanged += toolStrip_ForeColorChanged; | ||
| toolStrip.Disposed += toolStrip_Disposed; | ||
| } | ||
|
|
||
| static void toolStrip_Disposed(object sender, EventArgs e) | ||
| { | ||
| Data d = (Data)htData[sender]; | ||
| if (d != null && d.currentImages != null) | ||
| { | ||
| foreach (var img in d.currentImages) | ||
| img.Dispose(); | ||
| d.currentImages = null; | ||
| htData.Remove(sender); | ||
| } | ||
| } | ||
|
|
||
| static void toolStrip_ForeColorChanged(object sender, EventArgs e) | ||
| { | ||
| Data d = (Data)htData[sender]; | ||
| d.needsUpdate = true; | ||
| UpdateImages(d); | ||
| } | ||
|
|
||
| static void toolStrip_VisibleChanged(object sender, EventArgs e) | ||
| { | ||
| Data d = (Data)htData[sender]; | ||
| UpdateImages(d); | ||
| } | ||
|
|
||
| private static void UpdateImages(Data d) | ||
| { | ||
| if (!d.needsUpdate) | ||
| return; | ||
|
|
||
| Action a = () => | ||
| { | ||
| try | ||
| { | ||
| var list = GetChildWindows(d.toolStrip.Handle); | ||
| if (list.Count == 0) | ||
| return; | ||
| List<Image> newImages = new List<Image>(); | ||
| int k = 0; | ||
| foreach (var i in list) | ||
| { | ||
| var c = Control.FromHandle(i) as Label; | ||
| if (c != null && d.needsUpdate) | ||
| { | ||
| String glyph = (k == 0 ? "t" : "u"); | ||
| using (Font f = new System.Drawing.Font("Marlett", 20f)) | ||
| { | ||
| Size s = TextRenderer.MeasureText("t", f); | ||
| var oldImage = c.Image; | ||
| c.Image = new Bitmap(s.Width, s.Height); | ||
| newImages.Add(c.Image); | ||
| // avoid disposing the default image | ||
| // might cause problems, not sure | ||
| if (d.disposeLastImage) | ||
| oldImage.Dispose(); | ||
| using (Graphics g = Graphics.FromImage(c.Image)) | ||
| { | ||
| using (Brush b = new SolidBrush(d.toolStrip.ForeColor)) | ||
| g.DrawString(glyph, f, b, 0, 0); | ||
| } | ||
| c.AutoSize = true; | ||
| } | ||
| k++; | ||
| } | ||
| } | ||
| if (newImages.Count > 0) | ||
| { | ||
| d.needsUpdate = false; | ||
| d.disposeLastImage = true; | ||
| d.currentImages = newImages; | ||
| } | ||
| } | ||
| catch { } // protect against crash (just in case) | ||
| }; | ||
|
|
||
| d.toolStrip.BeginInvoke(a); | ||
| } | ||
|
|
||
| private static List<IntPtr> GetChildWindows(IntPtr parent) | ||
| { | ||
| List<IntPtr> result = new List<IntPtr>(); | ||
| GCHandle listHandle = GCHandle.Alloc(result); | ||
| try | ||
| { | ||
| EnumChildWindows(parent, enumProc, GCHandle.ToIntPtr(listHandle)); | ||
| } | ||
| finally | ||
| { | ||
| if (listHandle.IsAllocated) | ||
| listHandle.Free(); | ||
| } | ||
| return result; | ||
| } | ||
|
|
||
| private delegate bool EnumChildProc(IntPtr hWnd, IntPtr lParam); | ||
| private static EnumChildProc enumProc = new EnumChildProc(CallChildEnumProc); | ||
| private static bool CallChildEnumProc(IntPtr hWnd, IntPtr lParam) | ||
| { | ||
| GCHandle gch = GCHandle.FromIntPtr(lParam); | ||
| List<IntPtr> list = gch.Target as List<IntPtr>; | ||
| if (list == null) | ||
| throw new InvalidCastException("GCHandle Target could not be cast as List<IntPtr>"); | ||
|
|
||
| list.Add(hWnd); | ||
| return true; | ||
| } | ||
|
|
||
| [DllImport("user32.dll")] | ||
| private static extern bool EnumChildWindows(IntPtr hWndParent, EnumChildProc lpEnumFunc, IntPtr lParam); | ||
| } | ||
| } |
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