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103 lines
No EOL
2.7 KiB
C#
103 lines
No EOL
2.7 KiB
C#
#region License Information (GPL v3)
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/*
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ShareX - A program that allows you to take screenshots and share any file type
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Copyright (c) 2007-2023 ShareX Team
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Optionally you can also view the license at <http://www.gnu.org/licenses/>.
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*/
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#endregion License Information (GPL v3)
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using System;
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using System.Drawing;
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using System.Windows.Forms;
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namespace ShareX.HelpersLib
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{
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public class Canvas : UserControl
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{
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public delegate void DrawEventHandler(Graphics g);
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public event DrawEventHandler Draw;
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public int Interval { get; set; }
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private Timer timer;
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private bool needPaint;
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public Canvas()
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{
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Interval = 100;
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SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);
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}
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public void Start()
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{
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if (timer == null || !timer.Enabled)
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{
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Stop();
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timer = new Timer();
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timer.Interval = Interval;
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timer.Tick += timer_Tick;
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timer.Start();
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}
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}
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public void Start(int interval)
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{
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Interval = interval;
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Start();
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}
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public void Stop()
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{
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if (timer != null)
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{
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timer.Stop();
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timer.Dispose();
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}
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}
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protected override void Dispose(bool disposing)
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{
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Stop();
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base.Dispose(disposing);
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}
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private void timer_Tick(object sender, EventArgs e)
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{
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needPaint = true;
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Invalidate();
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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if (needPaint)
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{
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OnDraw(e.Graphics);
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needPaint = false;
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}
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}
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protected void OnDraw(Graphics g)
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{
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Draw?.Invoke(g);
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}
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}
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} |