mirror of https://github.com/dahall/Vanara.git
85 lines
3.2 KiB
C#
85 lines
3.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using Vanara.Extensions;
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using static Vanara.PInvoke.ComCtl32;
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using static Vanara.PInvoke.User32_Gdi;
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namespace Vanara.Windows.Forms
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{
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[ProvideProperty(ShowShield, typeof(ButtonBase))]
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[ProvideProperty(CueBanner, typeof(ComboBox))]
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[ProvideProperty(MinVisibleItems, typeof(ComboBox))]
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[ProvideProperty(CueBanner, typeof(TextBox))]
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public sealed class VistaControlExtender : Component, IExtenderProvider
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{
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internal const string CueBanner = "CueBanner";
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internal const string MinVisibleItems = "MinVisibleItems";
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internal const string ShowShield = "ShowShield";
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private readonly Dictionary<Component, Dictionary<string, object>> bag = new Dictionary<Component, Dictionary<string, object>>();
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private static bool IsMinVista { get; } = Environment.OSVersion.Version.Major >= 6;
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[DisplayName(ShowShield)]
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[DefaultValue(false)]
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[Category("Appearance")]
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[Description("Indicates whether a shield is shown on the button to indicate that elevated permissions are required to perform the action of the button.")]
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public bool GetShowShield(ButtonBase btn) => GetValue<bool>(btn, ShowShield);
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public void SetShowShield(ButtonBase btn, bool value)
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{
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if (SetValue(btn, ShowShield, value))
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btn.SetElevationRequiredState(value);
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}
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[DisplayName(CueBanner), DefaultValue(null), Category("Appearance")]
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[Description("Text that is displayed as a prompt for an unselected ComboBox.")]
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public string GetCueBanner(ComboBox comboBox) => GetValue<string>(comboBox, CueBanner);
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public void SetCueBanner(ComboBox comboBox, string value)
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{
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if (SetValue(comboBox, CueBanner, value))
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comboBox.SetCueBanner(value);
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}
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[DisplayName(MinVisibleItems), DefaultValue(30), Category("Appearance")]
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[Description("The minimum number of visible items in the drop-down list of a combo box.")]
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public int GetMinVisibleItems(ComboBox comboBox) => GetValue<int>(comboBox, MinVisibleItems, SendMessage(comboBox.Handle, (uint)ComboBoxMessage.CB_SETMINVISIBLE).ToInt32());
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public void SetMinVisibleItems(ComboBox comboBox, int value)
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{
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if (SetValue(comboBox, MinVisibleItems, value) && IsMinVista && comboBox.IsHandleCreated)
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SendMessage(comboBox.Handle, (uint)ComboBoxMessage.CB_SETMINVISIBLE, (IntPtr)value);
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}
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/*[DisplayName(CueBanner), DefaultValue(null), Category("Appearance")]
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[Description("Text that is displayed as a prompt for an unselected TextBox.")]
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public string GetCueBanner(TextBox textBox) => GetValue<string>(textBox, CueBanner);
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public void SetCueBanner(TextBox textBox, string value)
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{
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if (SetValue(textBox, CueBanner, value))
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textBox.SetCueBanner(value);
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}*/
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bool IExtenderProvider.CanExtend(object extendee) { return extendee is Component; }
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private T GetValue<T>(Component comp, string propName, T defValue = default)
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{
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try { return (T)bag[comp][propName]; } catch { }
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return defValue;
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}
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private bool SetValue<T>(Component comp, string propName, T value)
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{
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if (Equals(value, GetValue<T>(comp, propName))) return false;
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if (!bag.ContainsKey(comp))
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bag.Add(comp, new Dictionary<string, object>());
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bag[comp][propName] = value;
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return true;
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}
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}
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} |