DoubleBufferPanel: Panel with double buffer and utility functions.

2017-02-05 01:07:58 +01:00
parent 1fbb85c101
commit 11dab2e63e
4 changed files with 70 additions and 15 deletions
--- a/DoubleBufferPanel.cs
+++ b/DoubleBufferPanel.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace CsvView
+{
+    public class DoubleBufferPanel : Panel
+    {
+        public DoubleBufferPanel()
+        {
+            DoubleBuffered = true;
+            SetStyle(ControlStyles.UserPaint |
+                          ControlStyles.AllPaintingInWmPaint |
+                          ControlStyles.ResizeRedraw |
+                          ControlStyles.ContainerControl |
+                          ControlStyles.OptimizedDoubleBuffer |
+                          ControlStyles.SupportsTransparentBackColor
+                          , true);
+        }
+
+
+        [DllImport("user32.dll", CharSet = CharSet.Auto)]
+        public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);
+
+        private const int WM_SetRedraw = 0XB;
+
+        public void SuspendDrawing()
+        {
+            SuspendLayout();
+            SendMessage(Handle, WM_SetRedraw, false, 0);
+        }
+
+        public void ResumeDrawing()
+        {
+            ResumeLayout(true);
+            SendMessage(Handle, WM_SetRedraw, true, 0);
+            Refresh();
+        }
+
+    }
+}