Imported Upstream version 0.4.0upstream/0.4.0

1 files changed, 220 insertions, 0 deletions

diff --git a/src/gui/piePreviewAddSign.vala b/src/gui/piePreviewAddSign.vala
new file mode 100644
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+++ b/src/gui/piePreviewAddSign.vala
@@ -0,0 +1,220 @@
+/* 
+Copyright (c) 2011 by Simon Schneegans
+
+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 3 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 GLib.Math;
+
+namespace GnomePie {
+
+/////////////////////////////////////////////////////////////////////////    
+/// A liitle plus-sign displayed on the preview widget to indicate where
+/// the user may add a new Slice.
+/////////////////////////////////////////////////////////////////////////
+
+public class PiePreviewAddSign : GLib.Object {
+
+    /////////////////////////////////////////////////////////////////////
+    /// Gets emitted, when the users clicks on this object.
+    /////////////////////////////////////////////////////////////////////
+
+    public signal void on_clicked(int position);
+    
+    /////////////////////////////////////////////////////////////////////
+    /// The image used to display this oject.
+    /////////////////////////////////////////////////////////////////////
+    
+    public Image icon { get; private set; }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// True, when the add sign is currently visible.
+    /////////////////////////////////////////////////////////////////////
+    
+    public bool visible { get; private set; default=false; }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// The position of the sign in its parent Pie. May be 2.5 for
+    /// example.
+    /////////////////////////////////////////////////////////////////////
+    
+    private double position = 0;
+    
+    /////////////////////////////////////////////////////////////////////
+    /// The parent renderer.
+    /////////////////////////////////////////////////////////////////////
+
+    private unowned PiePreviewRenderer parent;  
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Some values used for displaying this sign.
+    /////////////////////////////////////////////////////////////////////
+    
+    private double time = 0;
+    private double max_size = 0; 
+    private double angle = 0; 
+    private AnimatedValue size; 
+    private AnimatedValue alpha; 
+    private AnimatedValue activity; 
+    private AnimatedValue clicked; 
+    
+    /////////////////////////////////////////////////////////////////////
+    /// C'tor, sets everything up.
+    /////////////////////////////////////////////////////////////////////
+
+    public PiePreviewAddSign(PiePreviewRenderer parent) {
+        this.parent = parent;
+        
+        this.size = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, 0, 0, 0, 2.0);
+        this.alpha = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, 0, 0, 0, 0.0);
+        this.activity = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, -3, -3, 0, 0.0);
+        this.clicked = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, 1, 1, 0, 0.0);
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Loads the desired icon for this sign.
+    /////////////////////////////////////////////////////////////////////
+
+    public void load() {
+        this.icon = new Icon("add", 36);
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Updates the position where this object should be displayed.
+    /////////////////////////////////////////////////////////////////////
+
+    public void set_position(int position) {
+        double new_position = position;
+        
+        if (!this.parent.drag_n_drop_mode)
+            new_position += 0.5;
+
+        this.position = new_position;
+        this.angle = 2.0 * PI * new_position/parent.slice_count();
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Makes this object visible.
+    /////////////////////////////////////////////////////////////////////
+    
+    public void show() {
+        this.visible = true;
+        this.size.reset_target(this.max_size, 0.3); 
+        this.alpha.reset_target(1.0, 0.3);   
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Makes this object invisible.
+    /////////////////////////////////////////////////////////////////////
+    
+    public void hide() {
+        this.visible = false;
+        this.size.reset_target(0.0, 0.3); 
+        this.alpha.reset_target(0.0, 0.3);     
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Updates the size of this object. All transitions will be smooth.
+    /////////////////////////////////////////////////////////////////////
+
+    public void set_size(double size) {
+        this.max_size = size;
+        this.size.reset_target(size, 0.5);
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Draws the sign to the given context.
+    /////////////////////////////////////////////////////////////////////
+
+    public void draw(double frame_time, Cairo.Context ctx) {
+
+        this.time += frame_time;
+        
+        this.size.update(frame_time);
+        this.alpha.update(frame_time);
+        this.activity.update(frame_time);
+        this.clicked.update(frame_time);
+        
+        if (this.parent.slice_count() == 0) {
+            ctx.save();
+            
+            double scale = this.clicked.val 
+                         + GLib.Math.sin(this.time*10)*0.02*this.alpha.val
+                         + this.alpha.val*0.08 - 0.1;
+            ctx.scale(scale, scale);
+        
+            // paint the image
+            icon.paint_on(ctx);
+                
+            ctx.restore();
+            
+        } else if (this.alpha.val*this.activity.val > 0) {
+            ctx.save();
+            
+            // distance from the center
+            double radius = 120;
+            
+            // transform the context
+            ctx.translate(cos(this.angle)*radius, sin(this.angle)*radius);
+            double scale = this.size.val*this.clicked.val 
+                         + this.activity.val*0.07
+                         + GLib.Math.sin(this.time*10)*0.03*this.activity.val
+                         - 0.1;
+            ctx.scale(scale, scale);
+        
+            // paint the image
+            icon.paint_on(ctx, this.alpha.val*this.activity.val);
+                
+            ctx.restore();
+        }
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Called when the mouse moves to another position.
+    /////////////////////////////////////////////////////////////////////
+    
+    public void on_mouse_move(double angle) {
+        double direction = 2.0 * PI * position/parent.slice_count();
+        double diff = fabs(angle-direction);
+        
+        if (diff > PI)
+	        diff = 2 * PI - diff;
+	    
+	    if (diff < 0.5*PI/parent.slice_count()) this.activity.reset_target(1.0, 1.0);
+        else                                    this.activity.reset_target(-3.0, 1.5);
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Called when a button of the mouse is pressed.
+    /////////////////////////////////////////////////////////////////////
+    
+    public void on_button_press(double x, double y) {
+        if (this.activity.end == 1.0) {
+            this.clicked.reset_target(0.9, 0.1);
+        }
+    }
+    
+    /////////////////////////////////////////////////////////////////////
+    /// Called when a button of the mouse is released.
+    /////////////////////////////////////////////////////////////////////
+    
+    public void on_button_release(double x, double y) {
+        if (this.clicked.end == 0.9) {
+            this.clicked.reset_target(1.0, 0.1);
+            this.on_clicked((int)this.position);
+        }
+    }
+}
+
+}