mirror of
https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
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417 lines
11 KiB
C#
417 lines
11 KiB
C#
// ============================================================================ '
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// NumericUpDownEx - v.1.3 '
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// ============================================================================ '
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// Author: Claudio Nicora '
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// WebSite: http://coolsoft.altervista.org '
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// CodeProject: http://www.codeproject.com/KB/edit/NumericUpDownEx.aspx '
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// License: CodeProject Open License '
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// http://www.codeproject.com/info/cpol10.aspx '
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// Feel free to contribute here: http://coolsoft.altervista.org '
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// ============================================================================ '
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using System;
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using System.Reflection;
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using System.Drawing;
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using System.ComponentModel;
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using System.Windows.Forms;
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namespace CodeImp.DoomBuilder.BuilderEffects
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{
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[DesignerCategory("code")]
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public class NumericUpDownEx : NumericUpDown
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{
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// reference to the underlying TextBox control
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private TextBox _textbox;
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// reference to the underlying UpDownButtons control
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private Control _upDownButtons;
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/// <summary>
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/// object creator
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/// </summary>
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public NumericUpDownEx()
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{
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// extract a reference to the underlying TextBox field
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_textbox = GetPrivateField<TextBox>(this, "upDownEdit");
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if (_textbox == null)
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{
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throw new ArgumentNullException(this.GetType().FullName + ": Can't find internal TextBox field.");
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}
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// extract a reference to the underlying UpDownButtons field
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_upDownButtons = GetPrivateField<Control>(this, "upDownButtons");
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if (_upDownButtons == null)
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{
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throw new ArgumentNullException(this.GetType().FullName + ": Can't find internal UpDown buttons field.");
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}
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// add handlers (MouseEnter and MouseLeave events of NumericUpDown
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// are not working properly)
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_textbox.MouseEnter += _mouseEnterLeave;
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_textbox.MouseLeave += _mouseEnterLeave;
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_upDownButtons.MouseEnter += _mouseEnterLeave;
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_upDownButtons.MouseLeave += _mouseEnterLeave;
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base.MouseEnter += _mouseEnterLeave;
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base.MouseLeave += _mouseEnterLeave;
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}
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/// <summary>
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/// Extracts a reference to a private underlying field
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/// </summary>
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protected static internal T GetPrivateField<T>(NumericUpDownEx ctrl, string fieldName) where T : Control
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{
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// find internal TextBox
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FieldInfo fi = typeof(NumericUpDown).GetField(fieldName, BindingFlags.FlattenHierarchy | BindingFlags.NonPublic | BindingFlags.Instance);
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// take some caution... they could change field name in the future!
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if (fi == null)
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{
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return null;
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}
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else
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{
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return fi.GetValue(ctrl) as T;
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}
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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if (_upDownButtons.Visible == false)
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{
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e.Graphics.Clear(this.BackColor);
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}
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base.OnPaint(e);
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}
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/// <summary>
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/// WndProc override to kill WN_MOUSEWHEEL message
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/// </summary>
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protected override void WndProc(ref Message m)
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{
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const int WM_MOUSEWHEEL = 0x20a;
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if (m.Msg == WM_MOUSEWHEEL)
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{
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switch (_interceptMouseWheel)
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{
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case InterceptMouseWheelMode.Always:
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// standard message
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base.WndProc(ref m);
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break;
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case InterceptMouseWheelMode.WhenMouseOver:
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if (_mouseOver)
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{
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// standard message
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base.WndProc(ref m);
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}
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break;
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case InterceptMouseWheelMode.Never:
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// kill the message
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return;
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}
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}
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else
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{
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base.WndProc(ref m);
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}
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}
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#region New properties
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[DefaultValue(false)]
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[Category("Behavior")]
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[Description("Automatically select control text when it receives focus.")]
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public bool AutoSelect
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{
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get { return _autoSelect; }
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set { _autoSelect = value; }
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}
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private bool _autoSelect;
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[Browsable(false)]
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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public int SelectionStart
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{
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get { return _textbox.SelectionStart; }
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set { _textbox.SelectionStart = value; }
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}
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[Browsable(false)]
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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public int SelectionLength
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{
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get { return _textbox.SelectionLength; }
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set { _textbox.SelectionLength = value; }
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}
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[Browsable(false)]
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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public string SelectedText
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{
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get { return _textbox.SelectedText; }
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set { _textbox.SelectedText = value; }
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}
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[DefaultValue(typeof(InterceptMouseWheelMode), "Always")]
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[Category("Behavior")]
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[Description("Enables MouseWheel only under certain conditions.")]
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public InterceptMouseWheelMode InterceptMouseWheel
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{
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get { return _interceptMouseWheel; }
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set { _interceptMouseWheel = value; }
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}
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private InterceptMouseWheelMode _interceptMouseWheel = InterceptMouseWheelMode.Always;
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public enum InterceptMouseWheelMode
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{
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/// <summary>MouseWheel always works (defauld behavior)</summary>
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Always,
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/// <summary>MouseWheel works only when mouse is over the (focused) control</summary>
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WhenMouseOver,
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/// <summary>MouseWheel never works</summary>
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Never
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}
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[DefaultValue(typeof(ShowUpDownButtonsMode), "Always")]
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[Category("Behavior")]
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[Description("Set UpDownButtons visibility mode.")]
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public ShowUpDownButtonsMode ShowUpDownButtons
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{
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get { return _showUpDownButtons; }
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set
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{
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_showUpDownButtons = value;
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// update UpDownButtons visibility
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UpdateUpDownButtonsVisibility();
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}
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}
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private ShowUpDownButtonsMode _showUpDownButtons = ShowUpDownButtonsMode.Always;
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public enum ShowUpDownButtonsMode
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{
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/// <summary>UpDownButtons are always visible (defauld behavior)</summary>
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Always,
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/// <summary>UpDownButtons are visible only when mouse is over the control</summary>
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WhenMouseOver
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}
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/// <summary>
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/// If set, incrementing value will cause it to restart from Minimum
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/// when Maximum is reached (and viceversa).
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/// </summary>
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[DefaultValue(false)]
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[Category("Behavior")]
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[Description("If set, incrementing value will cause it to restart from Minimum when Maximum is reached (and viceversa).")]
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public bool WrapValue
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{
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get { return _wrapValue; }
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set { _wrapValue = value; }
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}
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private bool _wrapValue;
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#endregion
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#region Text selection
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// select all the text on focus enter
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protected override void OnGotFocus(EventArgs e)
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{
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if (_autoSelect)
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{
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_textbox.SelectAll();
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}
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base.OnGotFocus(e);
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}
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// MouseUp will kill the SelectAll made on GotFocus.
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// Will restore it, but only if user have not made a partial text selection.
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protected override void OnMouseUp(MouseEventArgs mevent)
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{
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if (_autoSelect && _textbox.SelectionLength == 0)
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{
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_textbox.SelectAll();
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}
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base.OnMouseUp(mevent);
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}
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#endregion
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#region Additional events
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// these events will be raised correctly, when mouse enters on the textbox
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public new event EventHandler<EventArgs> MouseEnter;
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public new event EventHandler<EventArgs> MouseLeave;
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// Events raised BEFORE value decrement(increment
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public event CancelEventHandler BeforeValueDecrement;
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public event CancelEventHandler BeforeValueIncrement;
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// flag to track mouse position
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private bool _mouseOver;
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// this handler is called at each mouse Enter/Leave movement
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private void _mouseEnterLeave(object sender, EventArgs e)
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{
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Rectangle cr = RectangleToScreen(ClientRectangle);
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Point mp = MousePosition;
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// actual state
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bool isOver = cr.Contains(mp);
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// test if status changed
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if (_mouseOver ^ isOver)
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{
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// update state
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_mouseOver = isOver;
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if (_mouseOver)
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{
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if (MouseEnter != null)
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{
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MouseEnter(this, EventArgs.Empty);
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}
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}
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else
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{
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if (MouseLeave != null)
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{
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MouseLeave(this, EventArgs.Empty);
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}
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}
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}
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// update UpDownButtons visibility
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if (_showUpDownButtons != ShowUpDownButtonsMode.Always)
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{
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UpdateUpDownButtonsVisibility();
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}
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}
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#endregion
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#region Value increment/decrement management
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// raises the two new events
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public override void DownButton()
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{
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CancelEventArgs e = new CancelEventArgs();
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if (BeforeValueDecrement != null) {
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BeforeValueDecrement(this, e);
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}
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if (e.Cancel) return;
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if (_wrapValue && Value - Increment < Minimum) {
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Value = Maximum;
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} else {
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base.DownButton();
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}
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}
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public override void UpButton()
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{
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CancelEventArgs e = new CancelEventArgs();
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if (BeforeValueIncrement != null) {
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BeforeValueIncrement(this, e);
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}
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if (e.Cancel) return;
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if (_wrapValue && Value + Increment > Maximum) {
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Value = Minimum;
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} else {
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base.UpButton();
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}
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}
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#endregion
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#region UpDownButtons visibility management
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/// <summary>
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/// Show or hide the UpDownButtons, according to ShowUpDownButtons property value
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/// </summary>
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public void UpdateUpDownButtonsVisibility()
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{
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// test new state
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bool newVisible;
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switch (_showUpDownButtons)
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{
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case ShowUpDownButtonsMode.WhenMouseOver:
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newVisible = _mouseOver;
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break;
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default:
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newVisible = true;
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break;
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}
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// assign only if needed
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if (_upDownButtons.Visible != newVisible)
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{
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if (newVisible)
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{
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_textbox.Width = this.ClientRectangle.Width - _upDownButtons.Width;
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}
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else
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{
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_textbox.Width = this.ClientRectangle.Width;
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}
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_upDownButtons.Visible = newVisible;
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OnTextBoxResize(_textbox, EventArgs.Empty);
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this.Invalidate();
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}
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}
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/// <summary>
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/// Custom textbox size management
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/// </summary>
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protected override void OnTextBoxResize(object source, EventArgs e)
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{
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if (_textbox == null)
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return;
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if (_showUpDownButtons == ShowUpDownButtonsMode.Always)
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{
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// standard management
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base.OnTextBoxResize(source, e);
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}
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else
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{
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// custom management
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// change position if RTL
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bool fixPos = this.RightToLeft == RightToLeft.Yes ^ this.UpDownAlign == LeftRightAlignment.Left;
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if (_mouseOver)
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{
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_textbox.Width = this.ClientSize.Width - _textbox.Left - _upDownButtons.Width - 2;
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if (fixPos)
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_textbox.Location = new Point(16, _textbox.Location.Y);
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}
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else
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{
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if (fixPos)
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_textbox.Location = new Point(2, _textbox.Location.Y);
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_textbox.Width = this.ClientSize.Width - _textbox.Left - 2;
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}
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}
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}
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#endregion
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}
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}
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