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/*
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 {
/////////////////////////////////////////////////////////////////////////
/// The delete sign, displayed in the upper right corner of each
/// Slice.
/////////////////////////////////////////////////////////////////////////
public class PiePreviewDeleteSign : GLib.Object {
/////////////////////////////////////////////////////////////////////
/// Called when the user clicked on this sign.
/////////////////////////////////////////////////////////////////////
public signal void on_clicked();
/////////////////////////////////////////////////////////////////////
/// The image used to display this oject.
/////////////////////////////////////////////////////////////////////
public Image icon { get; private set; }
/////////////////////////////////////////////////////////////////////
/// Some constants determining the look and behaviour of this Slice.
/////////////////////////////////////////////////////////////////////
private static const int radius = 18;
private static const double globale_scale = 0.8;
private static const double click_cancel_treshold = 5;
/////////////////////////////////////////////////////////////////////
/// True, when the add sign is currently visible.
/////////////////////////////////////////////////////////////////////
private bool visible = false;
/////////////////////////////////////////////////////////////////////
/// Some AnimatedValues for smooth transitions.
/////////////////////////////////////////////////////////////////////
private AnimatedValue size;
private AnimatedValue alpha;
private AnimatedValue activity;
private AnimatedValue clicked;
/////////////////////////////////////////////////////////////////////
/// Storing the position where a mouse click was executed. Useful for
/// canceling the click when the mouse moves some pixels.
/////////////////////////////////////////////////////////////////////
private double clicked_x = 0.0;
private double clicked_y = 0.0;
/////////////////////////////////////////////////////////////////////
/// C'tor, sets everything up.
/////////////////////////////////////////////////////////////////////
public PiePreviewDeleteSign() {
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 an Action. All members are initialized accordingly.
/////////////////////////////////////////////////////////////////////
public void load() {
this.icon = new Icon("stock_delete", PiePreviewDeleteSign.radius*2);
}
/////////////////////////////////////////////////////////////////////
/// Makes this object visible.
/////////////////////////////////////////////////////////////////////
public void show() {
if (!this.visible) {
this.visible = true;
this.alpha.reset_target(1.0, 0.3);
}
}
/////////////////////////////////////////////////////////////////////
/// Makes this object invisible.
/////////////////////////////////////////////////////////////////////
public void hide() {
if (this.visible) {
this.visible = false;
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.size.reset_target(size, 0.2);
}
/////////////////////////////////////////////////////////////////////
/// Draws the sign to the given context.
/////////////////////////////////////////////////////////////////////
public void draw(double frame_time, Cairo.Context ctx) {
this.size.update(frame_time);
this.alpha.update(frame_time);
this.activity.update(frame_time);
this.clicked.update(frame_time);
if (this.alpha.val > 0) {
ctx.save();
// transform the context
double scale = (this.size.val*this.clicked.val
+ this.activity.val*0.2 - 0.2)*PiePreviewDeleteSign.globale_scale;
ctx.scale(scale, scale);
// paint the image
icon.paint_on(ctx, this.alpha.val);
ctx.restore();
}
}
/////////////////////////////////////////////////////////////////////
/// Called when the mouse moves to another position.
/////////////////////////////////////////////////////////////////////
public bool on_mouse_move(double x, double y) {
if (this.clicked.end == 0.9) {
double dist = GLib.Math.pow(x-this.clicked_x, 2) + GLib.Math.pow(y-this.clicked_y, 2);
if (dist > PiePreviewDeleteSign.click_cancel_treshold*PiePreviewDeleteSign.click_cancel_treshold)
this.clicked.reset_target(1.0, 0.1);
}
if (GLib.Math.fabs(x) <= PiePreviewDeleteSign.radius*PiePreviewDeleteSign.globale_scale && GLib.Math.fabs(y) <= PiePreviewDeleteSign.radius*PiePreviewDeleteSign.globale_scale) {
this.activity.reset_target(1.0, 0.2);
return true;
}
this.activity.reset_target(0.0, 0.2);
return false;
}
/////////////////////////////////////////////////////////////////////
/// Called when a button of the mouse is pressed.
/////////////////////////////////////////////////////////////////////
public bool on_button_press(double x, double y) {
if (this.activity.end == 1.0) {
this.clicked.reset_target(0.9, 0.1);
this.clicked_x = x;
this.clicked_y = y;
return true;
}
return false;
}
/////////////////////////////////////////////////////////////////////
/// Called when a button of the mouse is released.
/////////////////////////////////////////////////////////////////////
public bool on_button_release(double x, double y) {
if (this.clicked.end == 0.9) {
this.clicked.reset_target(1.0, 0.1);
this.on_clicked();
return true;
}
return false;
}
}
}
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