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Diffstat (limited to 'src/gui/piePreviewDeleteSign.vala')
| -rw-r--r-- | src/gui/piePreviewDeleteSign.vala | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/gui/piePreviewDeleteSign.vala b/src/gui/piePreviewDeleteSign.vala new file mode 100644 index 0000000..2ff3321 --- /dev/null +++ b/src/gui/piePreviewDeleteSign.vala @@ -0,0 +1,195 @@ +/* +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 const int radius = 18; + private const double globale_scale = 0.8; + private 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", 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)*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 > this.click_cancel_treshold*this.click_cancel_treshold) + this.clicked.reset_target(1.0, 0.1); + } + + if (GLib.Math.fabs(x) <= radius*globale_scale && GLib.Math.fabs(y) <= radius*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; + } +} + +} |