update release notes

README.md

@@ -3,7 +3,7 @@
 One Color Picker to rule them all! No overhelming menus or settings. An easy tool with the features you need.
 
 Features:
-* Pick a color
+* Pick a color with the zoomable Magnifier
 * Choose between multiple Color Formats
 * Let the Color History remember your last colors
 

data/com.github.ronnydo.colorpicker.appdata.xml

@@ -1,33 +1,136 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- Copyright 2017 Ronny Dobra <ronnydobra at arcor dot de> -->
-<component type="desktop">
-  <id>com.github.ronnydo.colorpicker.desktop</id>
-  <metadata_license>CC0-1.0</metadata_license>
-  <project_license>GPL-3.0+</project_license>
-  <name>Color Picker</name>
-  <summary>The most intuitive Color Picker to speed up your workflow.</summary>
-  <description>
-    <p>One Color Picker to rule them all! No overhelming menus or settings. An easy tool with the features you need.</p>
-    <p>Features:</p>
-     <ul>
-       <li>Pick a color</li>
-       <li>Choose between multiple Color Formats</li>
-       <li>Let the Color History remember your last colors</li>
-    </ul>
-  </description>
-  <provides>
-	<binary>com.github.ronnydo.colorpicker</binary>
-  </provides>
-  <screenshots>
-	<screenshot type="default">
-	  <image>https://raw.githubusercontent.com/ronnydo/colorpicker/master/data/screenshot.png</image>
-	</screenshot>
-  </screenshots>
-  <developer_name>Ronny Dobra</developer_name>
-  <url type="homepage">https://github.com/RonnyDo/ColorPicker</url>
-  <url type="bugtracker">https://github.com/RonnyDo/ColorPicker/issues</url>
-  <custom>
-     <value key="x-appcenter-color-primary">#A3FF91</value>
-     <value key="x-appcenter-color-primary-text">#333333</value>
-  </custom>
-</component>
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2017 Ronny Dobra <ronnydobra at arcor dot de> -->
+<component type="desktop">
+  <id>com.github.ronnydo.colorpicker.desktop</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0+</project_license>
+  <name>Color Picker</name>
+  <summary>The most intuitive Color Picker to speed up your workflow</summary>
+  <description>
+    <p>One Color Picker to rule them all! No overhelming menus or settings. An easy tool with the features you need.</p>
+    <p>Features:</p>
+     <ul>
+       <li>Pick a color with the zoomable Magnifier</li>
+       <li>Choose between multiple Color Formats</li>
+       <li>Let the Color History remember your last colors</li>
+    </ul>
+  </description>
+  ​<categories>
+​    <category>GTK</category>
+​    <category>Utility</category>
+	<category>Graphics</category>
+	<category>Development</category>
+  </categories>
+  <releases>
+	​<release version="1.0.1" date="2017-07-13" urgency="medium">
+	​  <description>
+	    <ul>
+		  <li>Improvements to avoid issue #19</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="1.0.0" date="2017-07-07" urgency="medium">
+	​  <description>
+	    <ul>
+		  <li>Main Release!</li>
+		  <li>Implement magnifier (issue #12)</li>
+		  <li>Use your mousewheel to zoom the magnifier in and out.</li>
+		  <li>Invalid AppData file (issue #17)</li>
+		  <li>Code cleanup</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="0.9.5" date="2017-06-27" urgency="medium">
+	​  <description>
+	    <ul>
+		  <li>Fix dark color scheme bug (issue #13)</li>
+		  <li>Enhance project description</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="0.9.4" date="2017-06-26" urgency="medium">
+	​  <description>
+	    <ul>
+		  <li>Fix build bug (issue #16)</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="0.9.3" date="2017-06-26" urgency="medium">
+	​  <description>
+	    <ul>
+		  <li>Color Picker now restores your recent window position, color format and color history! (issue #10, issue #11 and issue #15)</li>
+		  <li>Minor icon changes</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="0.9.2" date="2017-06-23" urgency="low">
+	​  <description>
+	    <ul>
+		  <li>Fix issue #8</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="0.9.1" date="2017-06-23" urgency="low">
+	​  <description>
+	    <ul>
+		  <li>Fix issue #8</li>
+		</ul>
+	  </description>
+	​</release>
+  	​<release version="0.9.0" date="2017-06-22" urgency="medium">
+	​  <description>
+		<ul>
+		  <li>Beta release</li>
+		  <li>Fix issue #4</li>
+		  <li>Fix issue #5</li>
+		  <li>Fix issue #6</li>
+		  <li>Fix issue #7</li>
+		  <li>Update icons</li>
+		  <li>Add German translation</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="0.1.2" date="2017-06-21" urgency="low">
+	​  <description>
+	    <ul>
+		  <li>Fix build information</li>
+		</ul>
+	  </description>
+	​</release>
+  	​<release version="0.1.1" date="2017-06-19" urgency="low">
+	​  <description>
+	    <ul>
+		  <li>Added debian files and logo files</li>
+		</ul>
+	  </description>
+	​</release>
+	​<release version="0.1.0" date="2017-06-15" urgency="low">
+	​  <description>
+		<ul>
+		  <li>First official release</li>
+		</ul>
+	  </description>
+	​</release>
+    <release version="1.0" date="2012-08-26"/>
+​  </releases>
+  <provides>
+	<binary>com.github.ronnydo.colorpicker</binary>
+  </provides>
+  <screenshots>
+	<screenshot type="default">
+      <caption>Normal variant</caption>
+	  <image>https://raw.githubusercontent.com/ronnydo/colorpicker/master/data/screenshot.png</image>
+	</screenshot>
+	<screenshot>
+      <caption>Dark variant</caption>
+	  <image>https://raw.githubusercontent.com/ronnydo/colorpicker/master/data/screenshot_dark.png</image>
+	</screenshot>
+  </screenshots>
+  <developer_name>Ronny Dobra</developer_name>
+  <url type="homepage">https://github.com/RonnyDo/ColorPicker</url>
+  <url type="bugtracker">https://github.com/RonnyDo/ColorPicker/issues</url>
+  <custom>
+     <value key="x-appcenter-color-primary">#A3FF91</value>
+     <value key="x-appcenter-color-primary-text">#333333</value>
+  </custom>
+</component>

data/com.github.ronnydo.colorpicker.desktop

@@ -3,7 +3,7 @@ Name=Color Picker
 Comment=An intuitive Color Picker
 Exec=com.github.ronnydo.colorpicker
 Icon=com.github.ronnydo.colorpicker
-Keywords=color;picker;selector;pipette;
+Keywords=colorpicker;color;picker;selector;pipette;
 Terminal=false
 Type=Application
 Categories=GTK;Utility;Graphics;Development;

data/com.github.ronnydo.colorpicker.gschema.xml

@@ -23,5 +23,10 @@
 	        <summary>Color History</summary>
 	        <description>Color History</description>
         </key>
+        <key name="zoomlevel" type="i">
+            <default>3</default>
+            <summary>Most recent zoomlevel of the picker's magnifier.</summary>
+            <description>Most recent zoomlevel of the picker's magnifier.</description>
+        </key>
     </schema>
 </schemalist>

debian/changelog

@@ -1,3 +1,25 @@
+com.github.ronnydo.colorpicker (1.0.1) xenial; urgency=medium
+
+  * Improvements to avoid issue #19
+  
+ -- Ronny Dobra <ronnydobra at arcor dot de>  Thu, 13 Jul 2017 01:45:00 +0100
+
+com.github.ronnydo.colorpicker (1.0.0) xenial; urgency=medium
+
+  * Main Release!
+  * Implement magnifier (issue #12)
+  * Use your mousewheel to zoom the magnifier in and out.
+  * Invalid AppData file (issue #17)
+  * Code cleanup
+  
+ -- Ronny Dobra <ronnydobra at arcor dot de>  Thu, 07 Jul 2017 12:00:00 +0100
+
+com.github.ronnydo.colorpicker (0.9.5) xenial; urgency=medium
+
+  * Fix issue #13
+  
+ -- Ronny Dobra <ronnydobra at arcor dot de>  Thu, 27 Jun 2017 23:20:00 +0100
+
 com.github.ronnydo.colorpicker (0.9.4) xenial; urgency=medium
 
   * Fix issue #16

debian/control

@@ -13,4 +13,4 @@ Package: com.github.ronnydo.colorpicker
 Architecture: any
 Depends: ${misc:Depends}, ${shlibs:Depends}
 Description: An intuitive Color Picker
- The most intuitive Color Picker to speed up your workflow.
+ The most intuitive Color Picker to speed up your workflow

meson.build

@@ -23,7 +23,7 @@ executable(
     'src/ExtRGBA.vala',
     'src/Widgets/ColorArea.vala',
     'src/Widgets/ColorHistory.vala',
-    'src/Widgets/MousePosition.vala',
+    'src/Widgets/Picker.vala',
     'src/Services/Settings.vala',
     c_args: c_args,
     dependencies: [

src/ColorPickerWindow.vala

@@ -30,7 +30,6 @@ namespace ColorPicker {
                 icon_name: "com.github.ronnydo.colorpicker",
                     title: _("Color Picker"),
                     resizable: false,
-                    //height_request: 500,
                     width_request: 500
             );
         }        
@@ -38,7 +37,7 @@ namespace ColorPicker {
         construct {
             // main box                       
             ext_active_color.parse ("#FFFFFF");
-            
+                                    
             var color_area = new ColorPicker.Widgets.ColorArea ();
             color_area.set_color (ext_active_color);
             
@@ -153,7 +152,7 @@ namespace ColorPicker {
                 		    		    		    		        
     		// activate color picker    
             pick_color_button.clicked.connect (() => {
-                var mouse_position = new ColorPicker.Widgets.MousePosition ();
+                var mouse_position = new ColorPicker.Widgets.Picker ();
                 mouse_position.show_all ();
                 
                 mouse_position.moved.connect ((t, color) => {
@@ -228,10 +227,14 @@ namespace ColorPicker {
                 
                 this.present ();                    
             });
-                                  
-                		          
+            
+            
             // trigger picker on startup
-            pick_color_button.clicked ();
+            this.show.connect(() => {            
+                pick_color_button.clicked ();
+            });
+                                  
+            
         }
         
         private void update_color_format_combobox_text (Gtk.Entry format_entry, int id) {			

src/Services/Settings.vala

@@ -29,6 +29,7 @@ namespace ColorPicker.Services {
         public int window_y { get; set; }
         public int color_format_index { get; set; }
         public string[] color_history { get; set; }
+        public int zoomlevel { get; set; }
 
         public static Settings get_instance () {
             if (instance == null) {

src/Widgets/ColorHistory.vala

@@ -29,12 +29,11 @@ namespace ColorPicker.Widgets {
         Gee.ArrayList<Gdk.RGBA?> color_list;
         
         const int border_width = 1;
-        const string border_color_string = "rgba(50, 50, 50, 0.4)";
+        
+        // hardcoded from /usr/share/themes/elementary/gtk-3.0/[gtk.css|gtk-dark.css]
+        const string border_color_string = "rgba(0, 0, 0, 0.25)";
         private Gdk.RGBA border_color = Gdk.RGBA();
-        
-        const string triangle_color_string = "#F5F5F5";
-        private Gdk.RGBA triangle_color = Gdk.RGBA();
-        
+                
         const int shadow_width = 16;    
         const string shadow_color_string = "#000000"; 
         //const string shadow_color_string = "#A9A9A9";
@@ -43,13 +42,12 @@ namespace ColorPicker.Widgets {
         int selected_color = 0;
         
         
-        public ColorHistory () {
+        public ColorHistory () {                    
             set_size_request (100, 28);
             add_events(Gdk.EventMask.BUTTON_PRESS_MASK | Gdk.EventMask.BUTTON_RELEASE_MASK | Gdk.EventMask.ENTER_NOTIFY_MASK);
             color_list = new Gee.ArrayList<Gdk.RGBA?> ();
-            restore_colors ();
+            restore_colors ();                       
             border_color.parse (border_color_string); 
-            triangle_color.parse (triangle_color_string);
         }
         
         construct {            
@@ -60,7 +58,7 @@ namespace ColorPicker.Widgets {
             var color_array = settings.color_history;
             
             if (color_array != null) {            
-                // if more colors should be saved as allowed, drop the oldest ones.
+                // drop oldest colors, if more colors are stored as allowed
                 if (max_colors < color_array.length) {
                     int offset = color_array.length - max_colors;
                     var sliced_array = color_array [offset:color_array.length];
@@ -105,14 +103,18 @@ namespace ColorPicker.Widgets {
         
         public Gee.ArrayList<Gdk.RGBA?> get_color_list () {
             return color_list;
-        }        
-        
+        }                
               
-        /* Widget is asked to draw itself */
         public override bool draw (Cairo.Context ctx) {
         
-            int width = get_allocated_width (); // better element_width / amount
+            if (color_list == null && color_list.size <= 0) {
+                return true;
+            }
+        
+            int width = get_allocated_width ();
             int height = get_allocated_height ();
+                        
+            var style_context = get_toplevel ().get_style_context ();
             
             // colorboxes
             for (int i = 0; i < color_list.size; i++) {     
@@ -127,8 +129,7 @@ namespace ColorPicker.Widgets {
                 Gdk.cairo_set_source_rgba (ctx, color_list.get (i));
                 
                 ctx.fill ();
-            }
-            
+            }            
              
             // simple shade
             ctx.new_path ();
@@ -140,8 +141,7 @@ namespace ColorPicker.Widgets {
             Gdk.cairo_set_source_rgba (ctx, s); 
             
             ctx.set_line_width (border_width);   
-            ctx.stroke ();
-                        
+            ctx.stroke ();                        
             
             /*
             // real faded shade
@@ -159,53 +159,40 @@ namespace ColorPicker.Widgets {
                 Gdk.cairo_set_source_rgba (ctx, shadow_color); 
                 ctx.stroke ();
             }
-            */
-               
-            // colorboxes border
+            */            
+                        
+            // triangle fill
             ctx.new_path ();
-            ctx.move_to (0, 0);
-            ctx.rel_line_to (width, 0);
-            ctx.rel_line_to (0, height);      
-            ctx.rel_line_to (-1 * width, 0);     
-            ctx.close_path ();
-              
-            Gdk.cairo_set_source_rgba (ctx, border_color);      
-            // fix: stright lines must be + 1 to appear same as diagonales
-            ctx.set_line_width (border_width + 1);   
-                      
+            int triangle_height = 10;
+            int triangle_width = 20;            
+            // fix: "+1" against rounding error
+            ctx.move_to ((width / color_list.size * selected_color + 1) + (width / color_list.size / 2 + 1) - triangle_width / 2, height);
+            ctx.rel_line_to (triangle_width / 2, -1 * triangle_height);
+            ctx.rel_line_to (triangle_width / 2, triangle_height);
+            ctx.close_path ();                                     
+            Gdk.cairo_set_source_rgba (ctx, style_context.get_background_color(Gtk.StateFlags.NORMAL));            
+            ctx.fill ();   
+           
+            
+            // triangle border (left tip -> tip -> right tip)
+            ctx.new_path ();    
+            Gdk.cairo_set_source_rgba (ctx, border_color); 
+            ctx.set_line_width (border_width);
+            ctx.move_to ((width / color_list.size * selected_color + 1) + (width / color_list.size / 2 + 1) - triangle_width / 2, height);
+            ctx.rel_line_to (triangle_width / 2, -1 * triangle_height);
+            ctx.rel_line_to (triangle_width / 2, triangle_height);
             ctx.stroke ();
             
-            
-            
-            // triangle (Is used to indicate the selected color, which isn't implemented yet)        
-            if (color_list.size > 0) {
-                ctx.new_path ();
-                int triangle_height = 10;
-                int triangle_width = 20;
-                
-                // fix: "+1" against rounding error
-                ctx.move_to ((width / color_list.size * selected_color + 1) + (width / color_list.size / 2 + 1), height - triangle_height);
-                ctx.rel_line_to (triangle_width / 2, triangle_height);
-                ctx.rel_line_to (-1 * triangle_width, 0);
-                ctx.close_path ();  
-                                       
-                Gdk.cairo_set_source_rgba (ctx, triangle_color);
-                
-                ctx.fill ();       
-                
-                // triangle border
-                ctx.new_path ();
-                // fix: "+1" against rounding error
-                ctx.move_to ((width / color_list.size * selected_color + 1) + (width / color_list.size / 2 + 1) - triangle_width / 2, height);
-                ctx.rel_line_to (triangle_width / 2, -1 * triangle_height);
-                ctx.rel_line_to (triangle_width / 2, triangle_height);
-                Gdk.cairo_set_source_rgba (ctx, border_color);
-                
-                ctx.set_line_width (border_width);
-                
-                ctx.stroke ();  
-            }            
-            
+            // continue from right triangle tip to draw around the ColorHistory border
+            ctx.set_line_width (border_width +1);
+            ctx.move_to ((width / color_list.size * selected_color + 1) + (width / color_list.size / 2 + 1) + triangle_width / 2, height);     
+            ctx.line_to (width, height);
+            ctx.line_to (width, 0);
+            ctx.line_to (0, 0); 
+            ctx.line_to (0, height);  
+            ctx.line_to ((width / color_list.size * selected_color + 1) + (width / color_list.size / 2 + 1) - triangle_width / 2, height);
+            ctx.stroke (); 
+                        
             return true;
         }
         

src/Widgets/MousePosition.vala

@@ -1,163 +0,0 @@
-/*
-* Copyright (c) 2017 Ronny Dobra (https://github.com/RonnyDo/ColorPicker)
-*
-* 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 2 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, write to the
-* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-* Boston, MA 02110-1301 USA
-*
-* Authored by: Ronny Dobra <ronnydobra at arcor dot de>
-*/
-
-namespace ColorPicker.Widgets {
-
-    public class MousePosition : Granite.Widgets.CompositedWindow {
-    
-        public signal void picked (Gdk.RGBA color);
-        public signal void cancelled ();
-        public signal void moved (Gdk.RGBA color);
-
-        construct {
-            type = Gtk.WindowType.POPUP;
-        }
-
-        public MousePosition () {
-            stick ();
-            set_resizable (true);
-            set_deletable (false);
-            set_skip_taskbar_hint (true);
-            set_skip_pager_hint (true);
-            set_keep_above (true);
-
-            var screen = get_screen ();
-            set_default_size (screen.get_width (), screen.get_height ());
-        }   
-
-        
-        public override bool button_release_event (Gdk.EventButton e) {
-            if (e.button != 1) {
-                return true;
-            }
-
-            Gdk.RGBA color = get_color_at ((int) e.x_root, (int) e.y_root);
-            picked (color);
-
-            return true;            
-        }
-
-
-        public override bool motion_notify_event (Gdk.EventMotion e) {
-            Gdk.RGBA color = get_color_at ((int) e.x_root, (int) e.y_root);
-            moved (color);
-            
-            return true;            
-        }
-
-
-        public override bool key_press_event (Gdk.EventKey e) {
-            if (e.keyval == Gdk.Key.Escape) {
-                cancelled ();
-            }
-
-            return true;            
-        }
-
-        public Gdk.RGBA get_color_at (int x, int y) {
-            Gdk.Window win = Gdk.get_default_root_window ();
-            Gdk.Pixbuf? pixbuf = Gdk.pixbuf_get_from_window (win, x, y, 1, 1);
-
-            if (pixbuf != null) {                
-                // see https://hackage.haskell.org/package/gtk3-0.14.6/docs/Graphics-UI-Gtk-Gdk-Pixbuf.html
-                uint8 red = pixbuf.get_pixels()[0];
-                uint8 green = pixbuf.get_pixels()[1];
-                uint8 blue = pixbuf.get_pixels()[2];
-                
-                Gdk.RGBA color = Gdk.RGBA();
-                string spec = "rgb(" + red.to_string() + "," + green.to_string() + "," + blue.to_string() + ")";
-                if (color.parse (spec)) {
-                    return color;                   
-                } else {
-                    stdout.printf("ERROR: Parse pixel rgb values failed.");
-                }                
-            }
-            
-            // fallback: default RGBA color
-            stdout.printf("ERROR: Gdk.pixbuf_get_from_window failed");
-            return Gdk.RGBA ();
-        }
-
-
-        public override void show_all () {
-            base.show_all ();
-            var manager = Gdk.Display.get_default ().get_device_manager ();
-            var pointer = manager.get_client_pointer ();
-            var keyboard = pointer.get_associated_device ();
-            var window = get_window ();
-
-            var status = pointer.grab (window,
-                        Gdk.GrabOwnership.NONE,
-                        false,
-                        Gdk.EventMask.BUTTON_PRESS_MASK | Gdk.EventMask.BUTTON_RELEASE_MASK | Gdk.EventMask.POINTER_MOTION_MASK,
-                        new Gdk.Cursor.for_display (window.get_display (), Gdk.CursorType.CROSSHAIR),
-                        Gtk.get_current_event_time ());
-
-            if (status != Gdk.GrabStatus.SUCCESS) {
-                pointer.ungrab (Gtk.get_current_event_time ());
-            }
-
-            if (keyboard != null) {
-                status = keyboard.grab (window,
-                        Gdk.GrabOwnership.NONE,
-                        false,
-                        Gdk.EventMask.KEY_PRESS_MASK,
-                        null,
-                        Gtk.get_current_event_time ());
-
-                if (status != Gdk.GrabStatus.SUCCESS) {
-                    keyboard.ungrab (Gtk.get_current_event_time ());
-                }                
-            }
-        }
-
-        public new void close () {
-            get_window ().set_cursor (null);
-            base.close ();
-        }
-
-        /*
-        public override bool draw (Cairo.Context ctx) {
-            if (!dragging) {
-                return true;
-            }
-
-            int w = get_allocated_width ();
-            int h = get_allocated_height ();
-
-            ctx.rectangle (0, 0, w, h);
-            ctx.set_source_rgba (0.1, 0.1, 0.1, 0.2);
-            ctx.fill ();
-
-            ctx.rectangle (0, 0, w, h);
-            ctx.set_source_rgb (0.7, 0.7, 0.7);
-            ctx.set_line_width (1.0);
-            ctx.stroke ();
-
-            return base.draw (ctx);
-        }
-    */
-
-
-
-    }
-
-}

src/Widgets/Picker.vala

@@ -0,0 +1,318 @@
+/*
+* Copyright (c) 2017 Ronny Dobra (https://github.com/RonnyDo/ColorPicker)
+*
+* 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 2 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, write to the
+* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+* Boston, MA 02110-1301 USA
+*
+* Authored by: Ronny Dobra <ronnydobra at arcor dot de>
+* Inspired by: https://github.com/stuartlangridge/ColourPicker/
+*/
+
+namespace ColorPicker.Widgets {
+
+    public class Picker : Granite.Widgets.CompositedWindow {
+    
+        public signal void picked (Gdk.RGBA color);
+        public signal void cancelled ();
+        public signal void moved (Gdk.RGBA color);
+
+        const string dark_border_color_string = "#333333";
+        private Gdk.RGBA dark_border_color = Gdk.RGBA();            
+
+        const string bright_border_color_string = "#FFFFFF";
+        private Gdk.RGBA bright_border_color = Gdk.RGBA();
+        
+        // 1. Snapsize is the amount of pixel going to be magnified by the zoomlevel.
+        // 2. The snapsize must be odd to have a 1px magnifier center.
+        // 3. Asure that snapsize*max_zoomlevel+shadow_width*2 is smaller than 2 * get_screen ().get_display ().get_maximal_cursor_size()
+        //    Valid: snapsize = 31, max_zoomlevel = 7, shadow_width = 15 --> 247px
+        //           get_maximal_cursor_size = 128 --> 256px
+        //    Otherwise the cursor starts to flicker. See https://github.com/stuartlangridge/ColourPicker/issues/6#issuecomment-277972290
+        //    and https://github.com/RonnyDo/ColorPicker/issues/19
+        int snapsize = 31;
+        int min_zoomlevel = 2;
+        int max_zoomlevel = 7;        
+        int zoomlevel = 3;
+        int shadow_width = 15;
+        
+        private Gdk.Cursor magnifier = null;
+                
+        construct {
+            type = Gtk.WindowType.POPUP;
+        }
+        
+
+        public Picker () {
+            stick ();
+            set_resizable (true);
+            set_deletable (false);
+            set_skip_taskbar_hint (true);
+            set_skip_pager_hint (true);
+            set_keep_above (true);            
+            
+            
+            dark_border_color.parse (dark_border_color_string);            
+            bright_border_color.parse (bright_border_color_string);
+            
+            // restore zoomlevel
+            if (settings.zoomlevel >= min_zoomlevel && settings.zoomlevel <= max_zoomlevel) {
+                zoomlevel = settings.zoomlevel;
+            }
+
+            var screen = get_screen ();            
+            set_default_size (screen.get_width (), screen.get_height ());
+        }   
+
+        
+        public override bool button_release_event (Gdk.EventButton e) {
+            if (e.button != 1) {
+                return true;
+            }
+
+            Gdk.RGBA color = get_color_at ((int) e.x_root, (int) e.y_root);
+            picked (color);
+
+            return true;            
+        }
+        
+       
+       public override bool draw (Cairo.Context cr) {           
+           return false;
+       }
+
+
+        public override bool motion_notify_event (Gdk.EventMotion e) {        
+            Gdk.RGBA color = get_color_at ((int) e.x_root, (int) e.y_root);
+            moved (color);
+            
+            set_magnifier_cursor ();
+            
+            return true;            
+        }
+                
+        
+        public override bool scroll_event (Gdk.EventScroll e)  {
+            switch (e.direction) {
+                case Gdk.ScrollDirection.UP:
+                    if (zoomlevel < max_zoomlevel) {
+                        zoomlevel++;
+                    }
+                    set_magnifier_cursor ();
+                    break;
+                case Gdk.ScrollDirection.DOWN:
+                    if (zoomlevel > min_zoomlevel) {
+                        zoomlevel--;
+                    }
+                    set_magnifier_cursor ();
+                    break;
+                default:
+                    break;
+             }
+             
+             return true;
+        }            
+        
+        
+        public void set_magnifier_cursor () {
+             // draw cursor
+             int px, py;
+             get_pointer (out px, out py);
+
+             var radius = snapsize * zoomlevel / 2;
+             
+             // take screenshot
+             
+             var latest_pb = snap (px - snapsize / 2, py - snapsize / 2, snapsize, snapsize);
+              
+             // Zoom that screenshot up, and grab a snapsize-sized piece from the middle
+             var scaled_pb = latest_pb.scale_simple (snapsize * zoomlevel + shadow_width * 2 , snapsize * zoomlevel + shadow_width * 2 , Gdk.InterpType.NEAREST);
+             
+             
+             // Create the base surface for our cursor
+             var base_surface = new Cairo.ImageSurface (Cairo.Format.ARGB32, snapsize * zoomlevel + shadow_width * 2 , snapsize * zoomlevel + shadow_width * 2);
+             var base_context = new Cairo.Context (base_surface);
+             
+             
+             // Create the circular path on our base surface
+             base_context.arc (radius + shadow_width, radius + shadow_width, radius, 0, 2 * Math.PI);
+ 
+             // Paste in the screenshot
+             Gdk.cairo_set_source_pixbuf (base_context, scaled_pb, 0, 0);
+ 
+             // Clip to that circular path, keeping the path around for later, and paint the pasted screenshot
+             base_context.save ();
+             base_context.clip_preserve ();
+             base_context.paint ();   
+             base_context.restore ();
+            
+ 
+             // Draw a shadow as outside magnifier border
+             double shadow_alpha = 0.6;       
+             base_context.set_line_width (1);
+             
+             for (int i = 0; i <= shadow_width; i++) {
+                 base_context.arc (radius + shadow_width, radius + shadow_width, radius + shadow_width- i, 0, 2 * Math.PI);
+                 Gdk.RGBA shadow_color = Gdk.RGBA();
+                 shadow_color.parse(dark_border_color_string);  
+                 shadow_color.alpha = shadow_alpha / ((shadow_width - i + 1)*(shadow_width - i + 1));   
+                 Gdk.cairo_set_source_rgba (base_context, shadow_color); 
+                 base_context.stroke ();
+             }
+             
+        
+            // Draw an outside bright magnifier border  
+            Gdk.cairo_set_source_rgba (base_context, bright_border_color);
+            base_context.arc (radius + shadow_width, radius + shadow_width, radius - 1, 0, 2 * Math.PI);
+            base_context.stroke(); 
+
+
+            // Draw inside square
+            base_context.set_line_width (1);
+            
+            Gdk.cairo_set_source_rgba (base_context, dark_border_color); 
+            base_context.move_to (radius + shadow_width - zoomlevel, radius + shadow_width - zoomlevel);
+            base_context.line_to (radius + shadow_width + zoomlevel, radius + shadow_width - zoomlevel);
+            base_context.line_to (radius + shadow_width + zoomlevel, radius + shadow_width + zoomlevel);
+            base_context.line_to (radius + shadow_width - zoomlevel, radius + shadow_width + zoomlevel);
+            base_context.close_path ();
+            base_context.stroke ();             
+
+            Gdk.cairo_set_source_rgba (base_context, bright_border_color);        
+            base_context.move_to (radius + shadow_width - zoomlevel + 1, radius + shadow_width - zoomlevel + 1);
+            base_context.line_to (radius + shadow_width + zoomlevel - 1, radius + shadow_width - zoomlevel + 1);
+            base_context.line_to (radius + shadow_width + zoomlevel - 1, radius + shadow_width + zoomlevel - 1);
+            base_context.line_to (radius + shadow_width - zoomlevel + 1, radius + shadow_width + zoomlevel - 1);
+            base_context.close_path ();
+            base_context.stroke ();
+
+
+            // turn the base surface into a pixbuf and thence a cursor
+            var drawn_pb = Gdk.pixbuf_get_from_surface(base_surface, 0, 0, base_surface.get_width(), base_surface.get_height());
+            
+            magnifier = new Gdk.Cursor.from_pixbuf(
+                get_screen ().get_display (),                
+                drawn_pb,
+                drawn_pb.get_width () / 2, 
+                drawn_pb.get_height () / 2);
+            
+            /*
+            uint max_cursor_width, max_cursor_height, default_cursor_width, default_cursor_height;;
+            get_screen ().get_display ().get_maximal_cursor_size (out max_cursor_width, out max_cursor_height);
+            print ("\n\nCursor size is " + drawn_pb.get_width().to_string () + "x" + drawn_pb.get_height().to_string ());
+            print ("\nAllowed size is " + max_cursor_width.to_string () + "x" + max_cursor_height.to_string ());    
+            print ("\nDefault size is " + get_screen ().get_display ().get_default_cursor_size ().to_string ());          
+            */
+                
+            // Set the cursor            
+            var manager = Gdk.Display.get_default ().get_device_manager ();
+            manager.get_client_pointer ().grab (
+                get_window (),
+                Gdk.GrabOwnership.APPLICATION,
+                true,
+                Gdk.EventMask.BUTTON_PRESS_MASK | Gdk.EventMask.POINTER_MOTION_MASK | Gdk.EventMask.SCROLL_MASK,
+                magnifier,
+                Gdk.CURRENT_TIME);      
+                                      
+        }     
+         
+        
+        public Gdk.Pixbuf? snap (int x, int y, int w, int h) {
+            var root = Gdk.get_default_root_window ();
+            
+            var screenshot = Gdk.pixbuf_get_from_window (root, x, y, w, h);                
+            return screenshot;
+        }
+
+
+        public override bool key_press_event (Gdk.EventKey e) {
+            if (e.keyval == Gdk.Key.Escape) {
+                cancelled ();
+            }
+
+            return true;            
+        }
+
+        public Gdk.RGBA get_color_at (int x, int y) {
+            var root = Gdk.get_default_root_window ();
+            Gdk.Pixbuf? pixbuf = Gdk.pixbuf_get_from_window (root, x, y, 1, 1);
+
+            if (pixbuf != null) {                
+                // see https://hackage.haskell.org/package/gtk3-0.14.6/docs/Graphics-UI-Gtk-Gdk-Pixbuf.html
+                uint8 red = pixbuf.get_pixels()[0];
+                uint8 green = pixbuf.get_pixels()[1];
+                uint8 blue = pixbuf.get_pixels()[2];
+                
+                Gdk.RGBA color = Gdk.RGBA();
+                string spec = "rgb(" + red.to_string() + "," + green.to_string() + "," + blue.to_string() + ")";
+                if (color.parse (spec)) {
+                    return color;                   
+                } else {
+                    stdout.printf("ERROR: Parse pixel rgb values failed.");
+                }                
+            }
+            
+            // fallback: default RGBA color
+            stdout.printf("ERROR: Gdk.pixbuf_get_from_window failed");
+            return Gdk.RGBA ();
+        }
+
+
+        public override void show_all () {
+            base.show_all ();                            
+            
+            var manager = Gdk.Display.get_default ().get_device_manager ();
+            var pointer = manager.get_client_pointer ();
+            var keyboard = pointer.get_associated_device ();
+            var window = get_window ();
+
+            var status = pointer.grab (window,
+                        Gdk.GrabOwnership.NONE,
+                        false,
+                        Gdk.EventMask.BUTTON_PRESS_MASK | Gdk.EventMask.BUTTON_RELEASE_MASK | Gdk.EventMask.POINTER_MOTION_MASK,
+                        new Gdk.Cursor.for_display (window.get_display (), Gdk.CursorType.CROSSHAIR),
+                        Gtk.get_current_event_time ());
+            
+            if (status != Gdk.GrabStatus.SUCCESS) {
+                pointer.ungrab (Gtk.get_current_event_time ());
+            }
+
+            // show magnifier
+            set_magnifier_cursor ();
+    
+            if (keyboard != null) {
+                status = keyboard.grab (window,
+                        Gdk.GrabOwnership.NONE,
+                        false,
+                        Gdk.EventMask.KEY_PRESS_MASK,
+                        null,
+                        Gtk.get_current_event_time ());
+
+                if (status != Gdk.GrabStatus.SUCCESS) {
+                    keyboard.ungrab (Gtk.get_current_event_time ());
+                }                
+            }
+        }        
+
+        public new void close () {
+            // save zoomlevel
+            settings.zoomlevel = zoomlevel;
+
+            get_window ().set_cursor (null);
+            base.close ();
+        }
+
+    }
+
+}