376 lines
11 KiB
C#
376 lines
11 KiB
C#
/******************************************************************************
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* SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
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* CopyRight (C) 2012-2020 ShenYongHua(沈永华).
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* QQ群：56829229 QQ：17612584 EMail：SunnyUI@qq.com
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*
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* Blog: https://www.cnblogs.com/yhuse
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* Gitee: https://gitee.com/yhuse/SunnyUI
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* GitHub: https://github.com/yhuse/SunnyUI
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*
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* SunnyUI.dll can be used for free under the GPL-3.0 license.
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* If you use this code, please keep this note.
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* 如果您使用此代码，请保留此说明。
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******************************************************************************
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* 文件名称: UIComboBox.cs
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* 文件说明: 组合框
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* 当前版本: V2.2
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* 创建日期: 2020-01-01
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*
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* 2020-01-01: V2.2.0 增加文件说明
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* 2020-06-11: V2.2.5 增加DataSource，支持数据绑定
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******************************************************************************/
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using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Drawing.Design;
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using System.Windows.Forms;
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using static System.Windows.Forms.ComboBox;
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namespace Sunny.UI
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{
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[DefaultProperty("Items")]
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[DefaultEvent("SelectedIndexChanged")]
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[ToolboxItem(true)]
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[LookupBindingProperties("DataSource", "DisplayMember", "ValueMember", "SelectedValue")]
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public sealed partial class UIComboBox : UIDropControl
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{
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public UIComboBox()
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{
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InitializeComponent();
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box.SelectedIndexChanged += Box_SelectedIndexChanged;
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box.DataSourceChanged += Box_DataSourceChanged;
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box.DisplayMemberChanged += Box_DisplayMemberChanged;
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box.ValueMemberChanged += Box_ValueMemberChanged;
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}
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private void Box_ValueMemberChanged(object sender, EventArgs e)
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{
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ValueMemberChanged?.Invoke(sender, e);
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}
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private void Box_DisplayMemberChanged(object sender, EventArgs e)
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{
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DisplayMemberChanged?.Invoke(sender, e);
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}
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private void Box_DataSourceChanged(object sender, EventArgs e)
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{
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DataSourceChanged?.Invoke(sender, e);
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}
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private void Box_SelectedIndexChanged(object sender, EventArgs e)
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{
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Text = box.GetItemText(box.SelectedItem);
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GetSelectedValue();
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SelectedValueChanged?.Invoke(this, e);
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SelectedIndexChanged?.Invoke(sender, e);
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}
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public event EventHandler SelectedIndexChanged;
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public event EventHandler DataSourceChanged;
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public event EventHandler DisplayMemberChanged;
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public event EventHandler ValueMemberChanged;
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public event EventHandler SelectedValueChanged;
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public readonly ComboBox box = new ComboBox();
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protected override void ItemForm_ValueChanged(object sender, object value)
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{
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SelectedIndex = ListBox.SelectedIndex;
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Invalidate();
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}
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private readonly UIComboBoxItem dropForm = new UIComboBoxItem();
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protected override void CreateInstance()
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{
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ItemForm = new UIDropDown(dropForm);
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}
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protected override int CalcItemFormHeight()
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{
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int interval = ItemForm.Height - ItemForm.ClientRectangle.Height;
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return 4 + Math.Min(ListBox.Items.Count, MaxDropDownItems) * ItemHeight + interval;
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}
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private UIListBox ListBox
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{
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get => dropForm.ListBox;
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}
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[DefaultValue(25)]
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public int ItemHeight
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{
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get => ListBox.ItemHeight;
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set => ListBox.ItemHeight = value;
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}
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[DefaultValue(8)]
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public int MaxDropDownItems { get; set; } = 8;
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private void UIComboBox_FontChanged(object sender, EventArgs e)
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{
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if (ItemForm != null)
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{
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ListBox.Font = Font;
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}
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}
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private void UIComboBox_ButtonClick(object sender, EventArgs e)
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{
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ListBox.Items.Clear();
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if (Items.Count == 0 || ItemForm.Visible)
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{
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return;
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}
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foreach (var data in Items)
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{
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ListBox.Items.Add(GetItemText(data));
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}
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ListBox.SelectedIndex = SelectedIndex;
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ItemForm.Show(this, new Size(Width, CalcItemFormHeight()));
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}
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public override void SetStyleColor(UIBaseStyle uiColor)
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{
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base.SetStyleColor(uiColor);
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if (uiColor.IsCustom()) return;
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ListBox.SetStyleColor(uiColor);
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}
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private object dataSource;
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[DefaultValue(null), RefreshProperties(RefreshProperties.Repaint), AttributeProvider(typeof(IListSource))]
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public object DataSource
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{
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get => dataSource;
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set
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{
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SetDataConnection(value, new BindingMemberInfo(DisplayMember));
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dataSource = value;
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box.Items.Clear();
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foreach (var obj in dataManager.List)
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{
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box.Items.Add(obj);
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}
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}
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}
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private bool inSetDataConnection;
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private CurrencyManager dataManager;
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private void SetDataConnection(object newDataSource, BindingMemberInfo newDisplayMember)
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{
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bool dataSourceChanged = dataSource != newDataSource;
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bool displayMemberChanged = !DisplayMember.Equals(newDisplayMember.BindingPath);
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if (inSetDataConnection)
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{
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return;
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}
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try
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{
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if (dataSourceChanged || displayMemberChanged)
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{
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CurrencyManager newDataManager = null;
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if (newDataSource != null && newDataSource != Convert.DBNull)
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{
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newDataManager = (CurrencyManager)BindingContext[newDataSource, newDisplayMember.BindingPath];
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}
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dataManager = newDataManager;
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}
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}
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finally
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{
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inSetDataConnection = false;
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}
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}
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//public int DropDownWidth { get; set; }
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
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[Editor("System.Windows.Forms.Design.ListControlStringCollectionEditor, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
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[Localizable(true)]
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[MergableProperty(false)]
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public ObjectCollection Items
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{
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get => box.Items;
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}
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[Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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public int SelectedIndex
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{
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get => box.SelectedIndex;
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set => box.SelectedIndex = value;
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}
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[Browsable(false), Bindable(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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public object SelectedItem
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{
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get => box.SelectedItem;
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set => box.SelectedItem = value;
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}
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[Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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public string SelectedText
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{
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get
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{
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if (DropDownStyle == UIDropDownStyle.DropDown)
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{
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return edit.SelectedText;
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}
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else
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{
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return Text;
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}
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}
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}
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public override void ResetText()
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{
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Clear();
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}
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[DefaultValue("")]
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[Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
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[TypeConverter("System.Windows.Forms.Design.DataMemberFieldConverter, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
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public string DisplayMember
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{
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get => box.DisplayMember;
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set
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{
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SetDataConnection(dataSource, new BindingMemberInfo(value));
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box.DisplayMember = value;
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}
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}
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[DefaultValue("")]
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[Editor("System.Windows.Forms.Design.FormatStringEditor, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
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[MergableProperty(false)]
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public string FormatString
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{
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get => box.FormatString;
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set => box.FormatString = value;
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}
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[DefaultValue(false)]
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public bool FormattingEnabled
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{
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get => box.FormattingEnabled;
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set => box.FormattingEnabled = value;
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}
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[DefaultValue("")]
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[Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
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public string ValueMember
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{
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get => box.ValueMember;
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set => box.ValueMember = value;
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}
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private object selectedValue;
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private void GetSelectedValue()
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{
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if (SelectedIndex != -1 && dataManager != null)
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{
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selectedValue = FilterItemOnProperty(SelectedItem, ValueMember);
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}
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else
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{
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selectedValue = null;
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}
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}
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[
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DefaultValue(null),
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Browsable(false),
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DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
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Bindable(true)
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]
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public object SelectedValue
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{
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get
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{
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GetSelectedValue();
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return selectedValue;
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}
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set
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{
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selectedValue = value;
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if (value == null)
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{
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return;
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}
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if (dataManager != null)
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{
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int index = DataManagerFind(value);
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SelectedIndex = index;
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}
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}
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}
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private int DataManagerFind(object value)
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{
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if (dataManager == null) return -1;
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for (int i = 0; i < dataManager.List.Count; i++)
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{
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var item = dataManager.List[i];
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if (FilterItemOnProperty(item, ValueMember).Equals(value))
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{
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return i;
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}
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}
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return -1;
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}
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private object FilterItemOnProperty(object item, string field)
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{
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if (item != null && field.Length > 0)
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{
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try
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{
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// if we have a dataSource, then use that to display the string
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PropertyDescriptor descriptor;
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if (dataManager != null)
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descriptor = dataManager.GetItemProperties().Find(field, true);
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else
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descriptor = TypeDescriptor.GetProperties(item).Find(field, true);
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if (descriptor != null)
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{
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item = descriptor.GetValue(item);
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}
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}
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catch
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{
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return null;
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}
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}
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return item;
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}
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public string GetItemText(object item)
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{
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return box.GetItemText(item);
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}
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}
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} |