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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 {
/////////////////////////////////////////////////////////////////////////
/// This class renders a Pie. In order to accomplish that, it owns a
/// CenterRenderer and some SliceRenderers.
/////////////////////////////////////////////////////////////////////////
public class PieRenderer : GLib.Object {
public int quick_action { get; private set; }
public int active_slice { get; private set; }
public bool show_hotkeys { get; set; }
private int size;
private Gee.ArrayList<SliceRenderer?> slices;
private CenterRenderer center;
private bool key_board_control = false;
public PieRenderer() {
this.slices = new Gee.ArrayList<SliceRenderer?>();
this.center = new CenterRenderer(this);
this.quick_action = -1;
this.active_slice = -2;
this.size = 0;
}
public void load_pie(Pie pie) {
this.slices.clear();
int count = 0;
foreach (var group in pie.action_groups) {
foreach (var action in group.actions) {
var renderer = new SliceRenderer(this);
this.slices.add(renderer);
renderer.load(action, slices.size-1);
if (action.is_quick_action) {
this.quick_action = count;
}
++count;
}
}
this.set_highlighted_slice(this.quick_action);
this.size = (int)fmax(2*Config.global.theme.radius + 2*Config.global.theme.slice_radius*Config.global.theme.max_zoom,
2*Config.global.theme.center_radius);
// increase size if there are many slices
if (slices.size > 0) {
this.size = (int)fmax(this.size,
(((Config.global.theme.slice_radius + Config.global.theme.slice_gap)/tan(PI/slices.size))
+ Config.global.theme.slice_radius)*2*Config.global.theme.max_zoom);
}
}
public void activate() {
if (this.active_slice >= 0 && this.active_slice < this.slices.size)
slices[active_slice].activate();
this.cancel();
}
public void cancel() {
foreach (var slice in this.slices)
slice.fade_out();
center.fade_out();
}
public void select_up() {
int bottom = this.slice_count()/4;
int top = this.slice_count()*3/4;
if (this.active_slice == -1 || this.active_slice == bottom)
this.set_highlighted_slice(top);
else if (this.active_slice > bottom && this.active_slice < top)
this.set_highlighted_slice(this.active_slice+1);
else if (this.active_slice != top)
this.set_highlighted_slice((this.active_slice-1+this.slice_count())%this.slice_count());
}
public void select_down() {
int bottom = this.slice_count()/4;
int top = this.slice_count()*3/4;
if (this.active_slice == -1 || this.active_slice == top)
this.set_highlighted_slice(bottom);
else if (this.active_slice > bottom && this.active_slice < top)
this.set_highlighted_slice(this.active_slice-1);
else if (this.active_slice != bottom)
this.set_highlighted_slice((this.active_slice+1)%this.slice_count());
}
public void select_left() {
int left = this.slice_count()/2;
int right = 0;
if (this.active_slice == -1 || this.active_slice == right)
this.set_highlighted_slice(left);
else if (this.active_slice > left)
this.set_highlighted_slice(this.active_slice-1);
else if (this.active_slice < left)
this.set_highlighted_slice(this.active_slice+1);
}
public void select_right() {
int left = this.slice_count()/2;
int right = 0;
if (this.active_slice == -1 || this.active_slice == left)
this.set_highlighted_slice(right);
else if (this.active_slice > left)
this.set_highlighted_slice((this.active_slice+1)%this.slice_count());
else if (this.active_slice < left && this.active_slice != right)
this.set_highlighted_slice((this.active_slice-1+this.slice_count())%this.slice_count());
}
public int slice_count() {
return slices.size;
}
public int get_size() {
return size;
}
public void draw(double frame_time, Cairo.Context ctx, int mouse_x, int mouse_y) {
double distance = sqrt(mouse_x*mouse_x + mouse_y*mouse_y);
double angle = 0.0;
if (this.key_board_control) {
angle = 2.0*PI*this.active_slice/(double)slice_count();
} else {
if (distance > 0) {
angle = acos(mouse_x/distance);
if (mouse_y < 0)
angle = 2*PI - angle;
}
int next_active_slice = this.active_slice;
if (distance < Config.global.theme.active_radius
&& this.quick_action >= 0 && this.quick_action < this.slices.size) {
next_active_slice = this.quick_action;
angle = 2.0*PI*quick_action/(double)slice_count();
} else if (distance > Config.global.theme.active_radius && this.slice_count() > 0) {
next_active_slice = (int)(angle*slices.size/(2*PI) + 0.5) % this.slice_count();
} else {
next_active_slice = -1;
}
this.set_highlighted_slice(next_active_slice);
}
center.draw(frame_time, ctx, angle, distance);
foreach (var slice in this.slices)
slice.draw(frame_time, ctx, angle, distance);
}
public void on_mouse_move() {
this.key_board_control = false;
}
public void set_highlighted_slice(int index) {
if (index != this.active_slice) {
if (index >= 0 && index < this.slice_count())
this.active_slice = index;
else if (this.quick_action >= 0)
this.active_slice = this.quick_action;
else
this.active_slice = -1;
SliceRenderer? active = (this.active_slice >= 0 && this.active_slice < this.slice_count()) ?
this.slices[this.active_slice] : null;
center.set_active_slice(active);
foreach (var slice in this.slices)
slice.set_active_slice(active);
this.key_board_control = true;
}
}
}
}
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