C#中垂直（仅）可调整大小的窗口形式
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Vertically (only) resizable windows form in C#
提问by Ben
I have a situation where it would be beneficial to me to allow my windows form to be resized by the user, but only vertically. After some searching, it seems like there isn't much on this particular subject. Is it possible?
我有一种情况，允许用户调整我的窗口窗体的大小对我来说是有益的，但只能垂直调整。经过一番搜索，似乎没有太多关于这个特定主题的内容。是否可以？
采纳答案by SLaks
You need to set the form's MinimumSizeand MaximumSizeproperties to two sizes with different heights but equal widths.
您需要将表单的MinimumSize和MaximumSize属性设置为高度不同但宽度相等的两种尺寸。
If you don't want the horizontal resize cursor to appear at all, you'll need to handle the WM_NCHITTESTmessage, like this:
如果您根本不希望出现水平调整大小光标，则需要处理该WM_NCHITTEST消息，如下所示：
protected override void WndProc(ref Message m) {
base.WndProc(ref m);
switch (m.Msg) {
case 0x84: //WM_NCHITTEST
var result = (HitTest)m.Result.ToInt32();
if (result == HitTest.Left || result == HitTest.Right)
m.Result = new IntPtr((int)HitTest.Caption);
if (result == HitTest.TopLeft || result == HitTest.TopRight)
m.Result = new IntPtr((int)HitTest.Top);
if (result == HitTest.BottomLeft || result == HitTest.BottomRight)
m.Result = new IntPtr((int)HitTest.Bottom);
break;
}
}
enum HitTest {
Caption = 2,
Transparent = -1,
Nowhere = 0,
Client = 1,
Left = 10,
Right = 11,
Top = 12,
TopLeft = 13,
TopRight = 14,
Bottom = 15,
BottomLeft = 16,
BottomRight = 17,
Border = 18
}
回答by Gabe
Set the max & min size for the width of the form only.
仅设置表单宽度的最大和最小尺寸。
回答by Paolo Tedesco
Just an idea...
只是一个想法...
public partial class Form1 : Form {
int _width;
public Form1() {
_width = this.Width;
InitializeComponent();
}
protected override void OnResize(EventArgs e) {
this.Width = _width;
base.OnResize(e);
}
}
EDIT: please note that the min/max size solutions work much better than this hack :)
编辑：请注意最小/最大尺寸解决方案比这个 hack 好得多:)
回答by Igor Korkhov
Yes, it is possible. Just set your form.MinimumSize.Width = form.MaximumSize.Width = 100 (or whatever width you want).
对的，这是可能的。只需设置您的 form.MinimumSize.Width = form.MaximumSize.Width = 100（或您想要的任何宽度）。
回答by Alex LE
Let the FormBorderStyle to Resizable and set MaximumSize and MinimumSize = new Size(this.Width, 0)
让 FormBorderStyle 为 Resizable 并设置 MaximumSize 和 MinimumSize = new Size(this.Width, 0)
Correction:
更正：
this.MinimumSize = new Size(this.Width, 0);
this.MaximumSize = new Size(this.Width, Int32.MaxValue);
回答by Dathan
To avoid the "rubber-banding" effect of @orsogufo's solution:
为避免@orsogufo 解决方案的“橡皮筋”效应：
public Form1()
{
InitializeComponent();
this.MinimumSize = new Size(500, 0);
this.MaximumSize = new Size(500, Screen.AllScreens.Max(s => s.Bounds.Height));
}
It won't correctly adjust its maximum height to accommodate a larger screen if you resize the screen bounds, but for static screen sizes it works great.
如果您调整屏幕边界的大小，它不会正确调整其最大高度以适应更大的屏幕，但对于静态屏幕尺寸，它效果很好。
