Added a PleaseWait form which allows the user to cancel the operation. This already is implemented for the Imgur plug-in but should be used for all the others with long operations. Also fixed a bug in the Imgur plug-in: while retrieving the history a "no longer available" answer was not processed.

git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@1984 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4

GreenshotPlugin/Controls/PleaseWaitForm.cs

@@ -0,0 +1,102 @@
+/*
+ * 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.Drawing;
+using System.Windows.Forms;
+using System.Threading;
+
+namespace GreenshotPlugin.Controls {
+	/// <summary>
+	/// Description of PleaseWaitForm.
+	/// </summary>
+	public partial class PleaseWaitForm : Form {
+		private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(PleaseWaitForm));
+		private Thread waitFor = null;
+		private string title;
+		public PleaseWaitForm() {
+			//
+			// The InitializeComponent() call is required for Windows Forms designer support.
+			//
+			InitializeComponent();
+			this.Icon = GreenshotPlugin.Core.GreenshotResources.getGreenshotIcon();
+		}
+		
+		/// <summary>
+		/// Prevent the close button showing
+		/// </summary>
+		private const int CP_NOCLOSE_BUTTON = 0x200;
+		protected override CreateParams CreateParams {
+			get {
+				CreateParams createParams = base.CreateParams;
+				createParams.ClassStyle = createParams.ClassStyle | CP_NOCLOSE_BUTTON ;
+				return createParams;
+			}
+		} 
+		
+		public void ShowAndWait(string title, string text, string cancelText, ThreadStart waitDelegate) {
+			this.title = title;
+			this.Text = title;
+			this.label_pleasewait.Text = text;
+			this.cancelButton.Text = cancelText;
+
+			Show();
+			
+			Exception threadException = null;
+			try {
+				// Wrap the passed delegate in a try/catch which saves the exception
+				waitFor = new Thread(new ThreadStart(
+					delegate {
+						try {
+							waitDelegate.Invoke();
+						} catch (Exception ex) {
+							threadException = ex;
+						}
+					})
+				);
+				waitFor.Name = title;
+				waitFor.IsBackground = true;
+				waitFor.SetApartmentState(ApartmentState.STA);
+				waitFor.Start();
+	
+				// Wait until finished
+				while (!waitFor.Join(TimeSpan.FromMilliseconds(100))) {
+					Application.DoEvents();
+				}
+				LOG.DebugFormat("Finished {0}", title);
+			} catch (Exception ex) {
+				LOG.Error(ex);
+				throw ex;
+			} finally {
+				Close();
+			}
+			// Check if an exception occured, if so throw it
+			if (threadException != null) {
+				throw threadException;
+			}
+		}
+		
+		void CancelButtonClick(object sender, EventArgs e) {
+			LOG.DebugFormat("Cancel clicked on {0}", title);
+			cancelButton.Enabled = false;
+			waitFor.Abort();
+		}
+	}
+}