Refactored the "thumbnail" preview code to ThumbnailForm.cs, this removes some complexity from the MainForm. Also fixed an Imgur issue, which I noticed as they currently have maintenance. And I added a missing key to the language-en-US.xml

git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@1909 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4

GreenshotPlugin/Controls/FormWithoutActivation.cs

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+/*
+ * Greenshot - a free and open source screenshot tool
+ * Copyright (C) 2007-2012  Thomas Braun, Jens Klingen, Robin Krom
+ * 
+ * For more information see: http://getgreenshot.org/
+ * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 1 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+using System;
+using System.Windows.Forms;
+
+namespace GreenshotPlugin.Controls {
+    /// <summary>
+    /// FormWithoutActivation is exactly like a normal form, but doesn't activate (steal focus)
+    /// </summary>
+    public class FormWithoutActivation : Form {
+        protected override bool ShowWithoutActivation {
+            get { return true; }
+        }
+    }
+}

GreenshotPlugin/Controls/ThumbnailForm.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows.Forms;
+using GreenshotPlugin.Core;
+using Greenshot.IniFile;
+using System.Drawing;
+using GreenshotPlugin.UnmanagedHelpers;
+
+namespace GreenshotPlugin.Controls {
+    public class ThumbnailForm : FormWithoutActivation {
+        private static CoreConfiguration conf = IniConfig.GetIniSection<CoreConfiguration>();
+
+        private IntPtr thumbnailHandle = IntPtr.Zero;
+        private Rectangle parentMenuBounds = Rectangle.Empty;
+
+        public ThumbnailForm() {
+            ShowInTaskbar = false;
+            FormBorderStyle = FormBorderStyle.None;
+            TopMost = false;
+            Enabled = false;
+            if (conf.WindowCaptureMode == WindowCaptureMode.Auto || conf.WindowCaptureMode == WindowCaptureMode.Aero) {
+                BackColor = Color.FromArgb(255, conf.DWMBackgroundColor.R, conf.DWMBackgroundColor.G, conf.DWMBackgroundColor.B);
+            } else {
+                BackColor = Color.White;
+            }
+
+            // cleanup at close
+            this.FormClosing += delegate {
+                UnregisterThumbnail();
+            };
+        }
+
+        public new void Hide() {
+            UnregisterThumbnail();
+            base.Hide();
+        }
+
+        private void UnregisterThumbnail() {
+            if (thumbnailHandle != IntPtr.Zero) {
+                DWM.DwmUnregisterThumbnail(thumbnailHandle);
+                thumbnailHandle = IntPtr.Zero;
+            }
+        }
+
+        public void ShowThumbnail(WindowDetails window, Control parentControl) {
+            UnregisterThumbnail();
+
+            DWM.DwmRegisterThumbnail(Handle, window.Handle, out thumbnailHandle);
+            if (thumbnailHandle != IntPtr.Zero) {
+                Rectangle windowRectangle = window.WindowRectangle;
+                int thumbnailHeight = 200;
+                int thumbnailWidth = (int)(thumbnailHeight * ((float)windowRectangle.Width / (float)windowRectangle.Height));
+                if (parentControl != null && thumbnailWidth > parentControl.Width) {
+                    thumbnailWidth = parentControl.Width;
+                    thumbnailHeight = (int)(thumbnailWidth * ((float)windowRectangle.Height / (float)windowRectangle.Width));
+                }
+                Width = thumbnailWidth;
+                Height = thumbnailHeight;
+                // Prepare the displaying of the Thumbnail
+                DWM_THUMBNAIL_PROPERTIES props = new DWM_THUMBNAIL_PROPERTIES();
+                props.Opacity = (byte)255;
+                props.Visible = true;
+                props.SourceClientAreaOnly = false;
+                props.Destination = new RECT(0, 0, thumbnailWidth, thumbnailHeight);
+                DWM.DwmUpdateThumbnailProperties(thumbnailHandle, ref props);
+                if (parentControl != null) {
+                    AlignToControl(parentControl);
+                }
+
+                if (!Visible) {
+                    Show();
+                }
+                // Make sure it's on "top"!
+                if (parentControl != null) {
+                    User32.SetWindowPos(Handle, parentControl.Handle, 0, 0, 0, 0, WindowPos.SWP_NOMOVE | WindowPos.SWP_NOSIZE | WindowPos.SWP_NOACTIVATE);
+                }
+            }
+        }
+
+        public void AlignToControl(Control alignTo) {
+            Rectangle screenBounds = WindowCapture.GetScreenBounds();
+            if (screenBounds.Contains(alignTo.Left, alignTo.Top - Height)) {
+                Location = new Point(alignTo.Left + (alignTo.Width / 2) - (Width / 2), alignTo.Top - Height);
+            } else {
+                Location = new Point(alignTo.Left + (alignTo.Width / 2) - (Width / 2), alignTo.Bottom);
+            }
+        }
+    }
+}