// COPYRIGHT (C) Tom. ALL RIGHTS RESERVED.
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// THE AntdUI PROJECT IS AN WINFORM LIBRARY LICENSED UNDER THE Apache-2.0 License.
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// LICENSED UNDER THE Apache License, VERSION 2.0 (THE "License")
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// YOU MAY NOT USE THIS FILE EXCEPT IN COMPLIANCE WITH THE License.
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// YOU MAY OBTAIN A COPY OF THE LICENSE AT
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING, SOFTWARE
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// DISTRIBUTED UNDER THE LICENSE IS DISTRIBUTED ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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// SEE THE LICENSE FOR THE SPECIFIC LANGUAGE GOVERNING PERMISSIONS AND
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// LIMITATIONS UNDER THE License.
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// GITEE: https://gitee.com/antdui/AntdUI
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// GITHUB: https://github.com/AntdUI/AntdUI
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// CSDN: https://blog.csdn.net/v_132
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// QQ: 17379620
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using System;
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using System.Drawing;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace AntdUI.In
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{
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public class FlowLayoutPanel : System.Windows.Forms.FlowLayoutPanel
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{
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ScrollY scrollY;
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public FlowLayoutPanel()
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{
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SetStyle(
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ControlStyles.Selectable |
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ControlStyles.AllPaintingInWmPaint |
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ControlStyles.OptimizedDoubleBuffer |
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ControlStyles.DoubleBuffer |
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ControlStyles.ResizeRedraw |
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ControlStyles.ContainerControl |
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ControlStyles.UserPaint, true);
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UpdateStyles();
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scrollY = new ScrollY(this);
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}
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#region 只为了隐藏滚动条
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#region 滚动条状态
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bool scrollYVisible = false;
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bool ScrollYVisible
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{
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get => scrollYVisible;
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set
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{
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if (scrollYVisible == value) return;
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scrollYVisible = value;
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if (!value) scrollY.SetVrSize(0, 0);
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OnSizeChanged(EventArgs.Empty);
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}
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}
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public override Rectangle DisplayRectangle
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{
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get
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{
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var rect = ClientRectangle.DeflateRect(Padding);
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if (scrollYVisible)
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{
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return new Rectangle(rect.X, rect.Y - VerticalScroll.Value, rect.Width - scrollY.Rect.Width, rect.Height);
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}
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return rect;
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}
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}
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#endregion
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//https://www.5axxw.com/questions/content/noi6a2
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protected override void OnSizeChanged(EventArgs e)
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{
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LoadScroll();
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base.OnSizeChanged(e);
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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LoadScroll();
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if (ScrollYVisible) scrollY.Paint(e.Graphics.High());
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base.OnPaint(e);
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}
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void LoadScroll()
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{
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ScrollYVisible = VerticalScroll.Visible;
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var rect = ClientRectangle;
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if (ScrollYVisible)
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{
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scrollY.SizeChange(rect);
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if (ScrollYVisible)
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{
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scrollY.SetVrSize(VerticalScroll.Maximum, rect.Height);
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scrollY.Value = VerticalScroll.Value;
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}
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}
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}
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protected override void WndProc(ref System.Windows.Forms.Message m)
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{
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switch (m.Msg)
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{
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case WM_PAINT:
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case WM_ERASEBKGND:
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case WM_NCCALCSIZE:
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if (DesignMode || !AutoScroll) break;
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ShowScrollBar(Handle, SB_SHOW_BOTH, false);
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break;
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case WM_MOUSEWHEEL:
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//int delta = (int)(m.WParam.ToInt64() >> 16);
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//int direction = Math.Sign(delta);
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ShowScrollBar(Handle, SB_SHOW_BOTH, false);
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break;
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}
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base.WndProc(ref m);
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}
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protected override void OnMouseDown(MouseEventArgs e)
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{
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if (scrollY.MouseDown(e.Location, value => { VerticalScroll.Value = (int)value; })) base.OnMouseDown(e);
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}
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protected override void OnMouseUp(MouseEventArgs e)
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{
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scrollY.MouseUp(e.Location);
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base.OnMouseUp(e);
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}
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protected override void OnMouseLeave(EventArgs e)
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{
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scrollY.Leave();
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base.OnMouseLeave(e);
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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if (scrollY.MouseMove(e.Location, value => { VerticalScroll.Value = (int)value; })) base.OnMouseMove(e);
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}
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private const int WM_PAINT = 0x000F;
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private const int WM_ERASEBKGND = 0x0014;
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private const int WM_NCCALCSIZE = 0x0083;
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private const int WM_MOUSEWHEEL = 0x020A;
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private const int SB_SHOW_VERT = 0x1;
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private const int SB_SHOW_BOTH = 0x3;
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[DllImport("user32.dll", SetLastError = true)]
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private static extern bool ShowScrollBar(IntPtr hWnd, int wBar, bool bShow);
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#endregion
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}
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}
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