gala/plugins/pip/SelectionArea.vala

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Vala
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//
// Copyright (C) 2017 Santiago León O., Adam Bieńkowski
//
// 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/>.
//
public class Gala.Plugins.PIP.SelectionArea : Clutter.Actor {
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public signal void captured (int x, int y, int width, int height);
public signal void selected (int x, int y);
public signal void closed ();
public Gala.WindowManager wm { get; construct; }
private Gala.ModalProxy? modal_proxy;
private Gdk.Point start_point;
private Gdk.Point end_point;
private bool dragging = false;
private bool clicked = false;
public SelectionArea (Gala.WindowManager wm) {
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Object (wm: wm);
}
construct {
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start_point = { 0, 0 };
end_point = { 0, 0 };
visible = true;
reactive = true;
int screen_width, screen_height;
wm.get_display ().get_size (out screen_width, out screen_height);
width = screen_width;
height = screen_height;
var canvas = new Clutter.Canvas ();
canvas.set_size (screen_width, screen_height);
canvas.draw.connect (draw_area);
set_content (canvas);
canvas.invalidate ();
}
public override bool key_press_event (Clutter.KeyEvent e) {
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if (e.keyval == Clutter.Key.Escape) {
close ();
closed ();
return true;
}
return false;
}
public override bool button_press_event (Clutter.ButtonEvent e) {
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if (dragging || e.button != 1) {
return true;
}
clicked = true;
start_point.x = (int) e.x;
start_point.y = (int) e.y;
return true;
}
public override bool button_release_event (Clutter.ButtonEvent e) {
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if (e.button != 1) {
return true;
}
if (!dragging) {
selected ((int) e.x, (int) e.y);
close ();
return true;
}
dragging = false;
clicked = false;
int x, y, w, h;
get_selection_rectangle (out x, out y, out w, out h);
close ();
start_point = { 0, 0 };
end_point = { 0, 0 };
this.hide ();
content.invalidate ();
captured (x, y, w, h);
return true;
}
public override bool motion_event (Clutter.MotionEvent e) {
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if (!clicked) {
return true;
}
end_point.x = (int) e.x;
end_point.y = (int) e.y;
content.invalidate ();
if (!dragging) {
dragging = true;
}
return true;
}
public void close () {
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wm.get_display ().set_cursor (Meta.Cursor.DEFAULT);
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if (modal_proxy != null) {
wm.pop_modal (modal_proxy);
}
}
public void start_selection () {
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wm.get_display ().set_cursor (Meta.Cursor.CROSSHAIR);
grab_key_focus ();
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modal_proxy = wm.push_modal ();
}
private void get_selection_rectangle (out int x, out int y, out int width, out int height) {
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x = int.min (start_point.x, end_point.x);
y = int.min (start_point.y, end_point.y);
width = (start_point.x - end_point.x).abs ();
height = (start_point.y - end_point.y).abs ();
}
private bool draw_area (Cairo.Context ctx) {
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Clutter.cairo_clear (ctx);
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if (!dragging) {
return true;
}
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int x, y, w, h;
get_selection_rectangle (out x, out y, out w, out h);
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ctx.rectangle (x, y, w, h);
ctx.set_source_rgba (0.1, 0.1, 0.1, 0.2);
ctx.fill ();
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ctx.rectangle (x, y, w, h);
ctx.set_source_rgb (0.7, 0.7, 0.7);
ctx.set_line_width (1.0);
ctx.stroke ();
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return true;
}
}