From 97fd142df917465017815f5bc40ef7c055d08bf3 Mon Sep 17 00:00:00 2001
From: Michael Vrhel <michael.vrhel@artifex.com>
Date: Mon, 10 Feb 2014 22:40:13 -0800
Subject: Addition of zoom control

Need a bit of work when window resizing occurs.
---
 platform/winrt/gsview/MainWindow.xaml    | 26 +++++++++--
 platform/winrt/gsview/MainWindow.xaml.cs | 79 +++++++++++++++++++++++++-------
 2 files changed, 84 insertions(+), 21 deletions(-)

(limited to 'platform')

diff --git a/platform/winrt/gsview/MainWindow.xaml b/platform/winrt/gsview/MainWindow.xaml
index 47a1ef25..fba0c0ce 100644
--- a/platform/winrt/gsview/MainWindow.xaml
+++ b/platform/winrt/gsview/MainWindow.xaml
@@ -130,9 +130,9 @@
             <MenuItem Header="_Options">
                 <MenuItem Header="Ghostscript" />
                 <MenuItem Header="Color" />
+                <MenuItem Header="Footer Control" IsCheckable="true" Checked="ShowFooter" Unchecked="HideFooter"/>
             </MenuItem>
 
-            <MenuItem Header="_Window" />
             <MenuItem Header="_Help" />
         </Menu>
         
@@ -359,7 +359,6 @@
             </Button>
         </Grid>
 
-
         <!-- The progress bar that runs during distilling -->
         <Grid x:Name="xaml_DistillGrid" DockPanel.Dock="Bottom" Visibility="Collapsed">
             <Grid.ColumnDefinitions>
@@ -386,7 +385,25 @@
                 <TextBlock><Bold>Cancel</Bold></TextBlock>
             </Button>
         </Grid>
-        
+
+        <!-- Footer control -->
+        <Grid x:Name="xaml_FooterControl" Background="WhiteSmoke" DockPanel.Dock="Bottom" Visibility="Collapsed">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto" />
+                <ColumnDefinition Width="Auto" />
+                <ColumnDefinition Width="Auto" />
+            </Grid.ColumnDefinitions>
+            <TextBlock Grid.Row="0" Grid.Column="0" Margin="5,0,0,0"><Bold>Zoom:</Bold></TextBlock>
+            <Slider x:Name="xaml_ZoomSlider" Grid.Row="0" Grid.Column="1" Margin="10, 0, 0, 0" 
+                Width="150" Orientation="Horizontal" HorizontalAlignment="Center" 
+                Value="100" Minimum="25" Maximum="400" 
+                SmallChange="1" LargeChange="1"
+                TickPlacement="None" TickFrequency="1"  IsSnapToTickEnabled="True" MouseLeftButtonUp="ZoomReleased" PreviewMouseUp="Testing"/>
+            <TextBox Grid.Row="0"  Grid.Column="2" Width="30" Height="20" VerticalScrollBarVisibility="Hidden" IsReadOnly="True" 
+                     HorizontalScrollBarVisibility="Hidden"  TextAlignment="Center" 
+                     Text="{Binding Mode=TwoWay, ElementName=xaml_ZoomSlider,Path=Value, UpdateSourceTrigger=PropertyChanged}" />
+        </Grid>
+
         <!-- Thumb viewer/selector -->
         <Grid x:Name="xaml_ThumbGrid" Width="100" Background="DarkGray" DockPanel.Dock="Left" Visibility="Collapsed">
             <ListView x:Name="xaml_ThumbList" HorizontalAlignment="Stretch" 
@@ -418,7 +435,8 @@
                       ItemTemplate="{StaticResource PageTemplate}" 
                       ScrollViewer.CanContentScroll="False" 
                       Background="DarkGray" ScrollViewer.PanningMode="Both"
-                      ScrollViewer.ScrollChanged="ListViewScrollChanged">
+                      ScrollViewer.ScrollChanged="ListViewScrollChanged"
+                      PreviewMouseLeftButtonUp="PageSelected">
                 <ListView.ItemContainerStyle>
                     <Style TargetType="ListViewItem">
                         <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
diff --git a/platform/winrt/gsview/MainWindow.xaml.cs b/platform/winrt/gsview/MainWindow.xaml.cs
index 71726468..f1698f6b 100644
--- a/platform/winrt/gsview/MainWindow.xaml.cs
+++ b/platform/winrt/gsview/MainWindow.xaml.cs
@@ -75,13 +75,13 @@ public struct spatial_info_t
 /* C# has no defines.... */
 static class Constants
 {
-	public const int LOOK_AHEAD = 2;  /* A +/- count on the pages to pre-render */
+	public const int LOOK_AHEAD = 1;  /* A +/- count on the pages to pre-render */
 	public const int THUMB_PREADD = 10;
 	public const double MIN_SCALE = 0.5;
 	public const double SCALE_THUMB = 0.05;
 	public const int BLANK_WIDTH = 17;
 	public const int BLANK_HEIGHT = 22;
-	public const double KEYBOARD_ZOOM_STEP = 0.25;
+	public const double ZOOM_STEP = 0.25;
 	public const int ZOOM_MAX = 4;
 	public const double ZOOM_MIN = 0.25;
 	public const int KEY_PLUS = 0xbb;
@@ -144,6 +144,7 @@ namespace gsview
 		bool m_isXPS;
 		gsOutput m_gsoutput;
 		Convert m_convertwin;
+		bool m_zoomhandled;
 
 		public MainWindow()
 		{
@@ -225,6 +226,7 @@ namespace gsview
 			m_rectlist_page = -1;
 			m_doczoom = 1.0;
 			m_isXPS = false;
+			m_zoomhandled = false;
 			return result;
 		}
 
@@ -232,21 +234,19 @@ namespace gsview
 		{
 			if (type == NotifyType_t.MESS_ERROR)
 			{
-			//	System.Windows.Forms.MessageBox.Show(Message, "Error",
-			//		MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
+				System.Windows.Forms.MessageBox.Show(Message, "Error",
+					MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
 			}
 			else
 			{
-			//	System.Windows.Forms.MessageBox.Show(Message, "Notice",
-			//		MessageBoxButtons.OK);
+				System.Windows.Forms.MessageBox.Show(Message, "Notice",
+					MessageBoxButtons.OK);
 			}
 		}
 
 		private void CloseDoc()
 		{
 
-
-
 		}
 
 		/* Set the page with the new raster information */
@@ -424,9 +424,7 @@ namespace gsview
 				/* Set if this is already xps for printing */
 				if (extension.ToUpper() == ".XPS")
 					m_isXPS = true;
-
 				StartViewer(dlg.FileName);
-
 			}
 		}
 
@@ -546,7 +544,7 @@ namespace gsview
 
 		private void OnBackPageClick(object sender, RoutedEventArgs e)
 		{
-			if (m_currpage == 0) return;
+			if (m_currpage == 0 || !m_init_done) return;
 
 			m_currpage = m_currpage - 1;
 			xaml_PageList.ScrollIntoView(m_docPages[m_currpage]);
@@ -554,7 +552,7 @@ namespace gsview
 
 		private void OnForwardPageClick(object sender, RoutedEventArgs e)
 		{
-			if (m_currpage == m_num_pages - 1) return;
+			if (m_currpage == m_num_pages - 1 || !m_init_done) return;
 
 			m_currpage = m_currpage + 1;
 			xaml_PageList.ScrollIntoView(m_docPages[m_currpage]);
@@ -607,6 +605,7 @@ namespace gsview
 			var item = ((FrameworkElement)e.OriginalSource).DataContext as DocPage;
 			if (item != null)
 			{
+				m_currpage = item.PageNum;
 				xaml_PageList.ScrollIntoView(m_docPages[item.PageNum]);
 			}
 		}
@@ -616,6 +615,7 @@ namespace gsview
 			var item = ((FrameworkElement)e.OriginalSource).DataContext as ContentItem;
 			if (item != null && item.Page < m_num_pages)
 			{
+				m_currpage = m_docPages[item.Page].PageNum;
 				xaml_PageList.ScrollIntoView(m_docPages[item.Page]);
 			}
 		}
@@ -632,6 +632,7 @@ namespace gsview
 					if (found != null)
 					{
 						var Item = (DocPage)found;
+						m_currpage = Item.PageNum;
 						RenderRange(Item.PageNum);
 					}
 					return;
@@ -645,7 +646,6 @@ namespace gsview
 			spatial_info_t spatial_info = InitSpatial(m_doczoom);
 			int range = Constants.LOOK_AHEAD;
 
-			range = 0;  // debug
 			for (int k = curr_page - range; k <= curr_page + range; k++)
 			{
 				if (k >= 0 && k < m_num_pages)
@@ -747,12 +747,20 @@ namespace gsview
 
 		private void ZoomOut(object sender, RoutedEventArgs e)
 		{
-
+			m_doczoom = m_doczoom - Constants.ZOOM_STEP;
+			if (m_doczoom < Constants.ZOOM_MIN)
+				m_doczoom = Constants.ZOOM_MIN;
+			xaml_ZoomSlider.Value = m_doczoom * 100.0;
+			RenderRange(m_currpage);
 		}
 
 		private void ZoomIn(object sender, RoutedEventArgs e)
 		{
-
+			m_doczoom = m_doczoom + Constants.ZOOM_STEP;
+			if (m_doczoom > Constants.ZOOM_MAX)
+				m_doczoom = Constants.ZOOM_MAX;
+			xaml_ZoomSlider.Value = m_doczoom * 100.0;
+			RenderRange(m_currpage);
 		}
 
 		private void CancelSearchClick(object sender, RoutedEventArgs e)
@@ -811,12 +819,10 @@ namespace gsview
 					break;
 
 				case GS_Task_t.SAVE_RESULT:
-
 					break;
 			}
 		}
 
-
 		/* Printing is achieved using xpswrite device in ghostscript and
 		 * pushing that file through the XPS print queue */
 		private void Print(object sender, RoutedEventArgs e)
@@ -901,6 +907,45 @@ namespace gsview
 				m_convertwin.Show();
 			}
 		}
+
+		private void ShowFooter(object sender, RoutedEventArgs e)
+		{
+			xaml_FooterControl.Visibility = System.Windows.Visibility.Visible;
+		}
+
+		private void HideFooter(object sender, RoutedEventArgs e)
+		{
+			xaml_FooterControl.Visibility = System.Windows.Visibility.Collapsed;
+		}
+
+		private void PageSelected(object sender, MouseButtonEventArgs e)
+		{
+			var item = ((FrameworkElement)e.OriginalSource).DataContext as DocPage;
+			if (item != null)
+			{
+				m_currpage = item.PageNum;
+				xaml_PageList.ScrollIntoView(m_docPages[item.PageNum]);
+			}
+		}
+
+		private void ZoomReleased(object sender, MouseButtonEventArgs e)
+		{
+			if (m_init_done)
+			{
+				m_doczoom = xaml_ZoomSlider.Value / 100.0;
+				RenderRange(m_currpage);
+			}
+		}
+
+		private void Testing(object sender, MouseButtonEventArgs e)
+		{
+			if (m_init_done)
+			{
+				m_doczoom = xaml_ZoomSlider.Value / 100.0;
+				RenderRange(m_currpage);
+			}
+		}
+
 	}
 }
 
-- 
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