mirror of
https://github.com/LorenzCK/OnTopReplica.git
synced 2024-06-03 19:14:36 +12:00
a649deb174
Weird bug on "region box" removed.
134 lines
5.2 KiB
C#
134 lines
5.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Windows.Forms;
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using System.Runtime.InteropServices;
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using VistaControls.Dwm.Helpers;
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using System.Drawing;
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namespace OnTopReplica {
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/// <summary>
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/// Form that automatically keeps a certain aspect ratio and resizes without flickering.
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/// </summary>
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public class AspectRatioForm : GlassForm {
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public AspectRatioForm() {
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AspectRatio = 1.0;
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}
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bool _keepAspectRatio = true;
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public bool KeepAspectRatio {
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get {
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return _keepAspectRatio;
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}
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set {
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_keepAspectRatio = value;
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if (value)
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RefreshAspectRatio();
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}
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}
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double _aspectRatio = 1.0;
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public double AspectRatio {
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get {
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return _aspectRatio;
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}
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set {
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if (value <= 0.0 || Double.IsInfinity(value))
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return;
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_aspectRatio = value;
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}
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}
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Padding _extraPadding;
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public Padding ExtraPadding {
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get {
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return _extraPadding;
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}
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set {
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_extraPadding = value;
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if(KeepAspectRatio)
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RefreshAspectRatio();
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}
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}
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/// <summary>
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/// Forces the form to update its height based on the current aspect ratio setting.
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/// </summary>
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public void RefreshAspectRatio() {
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ClientSize = new Size(ClientSize.Width,
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(int)((ClientSize.Width - ExtraPadding.Horizontal) / AspectRatio) + ExtraPadding.Vertical);
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}
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/// <summary>
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/// Updates the aspect ratio of the form and forces a refresh.
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/// </summary>
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public void SetAspectRatio(Size aspectRatioSource) {
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_keepAspectRatio = true; //set without updating
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AspectRatio = ((double)aspectRatioSource.Width / (double)aspectRatioSource.Height);
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RefreshAspectRatio();
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}
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protected override void OnResizeEnd(EventArgs e) {
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base.OnResizeEnd(e);
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//Ensure that the ClientSize of the form is always respected (not ensured by the WM_SIZING message alone)
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if (KeepAspectRatio) {
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//Since WM_SIZING already fixes up the size almost correctly,
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//simply set the height to the correct value
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var newHeight = (int)((ClientSize.Width - ExtraPadding.Horizontal) / AspectRatio + ExtraPadding.Vertical);
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ClientSize = new Size(ClientSize.Width, newHeight);
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}
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}
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/// <summary>
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/// Override WM_SIZING message to restrict resizing.
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/// Taken from: http://www.vcskicks.com/maintain-aspect-ratio.php
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/// </summary>
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protected override void WndProc(ref Message m) {
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if (KeepAspectRatio && m.Msg == NativeMethods.WM_SIZING) {
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var rc = (NativeMethods.Rectangle)Marshal.PtrToStructure(m.LParam, typeof(NativeMethods.Rectangle));
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int res = m.WParam.ToInt32();
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if (res == NativeMethods.WMSZ_LEFT || res == NativeMethods.WMSZ_RIGHT) {
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//Left or right resize -> adjust height (bottom)
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int targetHeight = (int)Math.Ceiling((Width - ExtraPadding.Horizontal) / AspectRatio) + ExtraPadding.Vertical;
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int originalHeight = rc.Bottom - rc.Top;
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int diffHeight = originalHeight - targetHeight;
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rc.Top += (diffHeight / 2);
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rc.Bottom = rc.Top + targetHeight;
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}
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else if (res == NativeMethods.WMSZ_TOP || res == NativeMethods.WMSZ_BOTTOM) {
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//Up or down resize -> adjust width (right)
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int targetWidth = (int)Math.Ceiling((Height - ExtraPadding.Vertical) * AspectRatio) + ExtraPadding.Horizontal;
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int originalWidth = rc.Right - rc.Left;
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int diffWidth = originalWidth - targetWidth;
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rc.Left += (diffWidth / 2);
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rc.Right = rc.Left + targetWidth;
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}
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else if (res == NativeMethods.WMSZ_RIGHT + NativeMethods.WMSZ_BOTTOM || res == NativeMethods.WMSZ_LEFT + NativeMethods.WMSZ_BOTTOM) {
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//Lower-right/left corner resize -> adjust height (could have been width)
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rc.Bottom = rc.Top + (int)Math.Ceiling((Width - ExtraPadding.Horizontal) / AspectRatio) + ExtraPadding.Vertical;
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}
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else if (res == NativeMethods.WMSZ_LEFT + NativeMethods.WMSZ_TOP || res == NativeMethods.WMSZ_RIGHT + NativeMethods.WMSZ_TOP) {
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//Upper-left/right corner -> adjust width (could have been height)
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rc.Top = rc.Bottom - (int)Math.Ceiling((Width - ExtraPadding.Horizontal) / AspectRatio) + ExtraPadding.Vertical;
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}
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Marshal.StructureToPtr(rc, m.LParam, true);
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}
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base.WndProc(ref m);
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}
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}
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}
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