MapWindow5/src/MW5.UI/Menu/ComboBoxMenuItem.cs at develop · MapWindow/MapWindow5 · GitHub

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using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.Diagnostics;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using MW5.Plugins.Events;

using MW5.Plugins.Interfaces;

using MW5.Shared;

using Syncfusion.Windows.Forms.Tools.XPMenus;

namespace MW5.UI.Menu

{

internal class ComboBoxMenuItem: MenuItem, IComboBoxMenuItem

{

private int _listenerCount = 0;

private string _lastValue = string.Empty;

internal ComboBoxMenuItem(BarItem item)

: base(item)

{

var combo = ComboItem;

combo.SizeToFit = true;

combo.MaxDropDownItems = 10;

}

private void combo_Click(object sender, EventArgs e)

{

var combo = ComboItem;

// the new value isn't assigned to TextBoxValue property when Enter is pressed

// http: //www.syncfusion.com/forums/28969/using-comboboxbaritem

// let's use this hack to get it

var textBox = ReflectionHelper.GetInstanceField(combo, "ComboTextBox") as TextBoxBase;

FireValueChanged(textBox != null ? textBox.Text : combo.TextBoxValue);

}

private void FireValueChanged(string newValue)

{

// Make sure that the event passed to listeners only once.

// Both Click and TextBoxValueChange will be fired when user select and item

// while in other cases only one of them is fired.

if (newValue == _lastValue) return;

_lastValue = newValue;

var handler = _valueChanged;

if (handler != null)

{

handler(this, new StringValueChangedEventArgs(newValue));

}

private ComboBoxBarItem ComboItem

{

get { return _item as ComboBoxBarItem; }

}

public StringCollection DataSource

{

get { return ComboItem.ChoiceList; }

}

public int Width

{

get { return ComboItem.MinWidth; }

set { ComboItem.MinWidth = value; }

}

private EventHandler<StringValueChangedEventArgs> _valueChanged;

public event EventHandler<StringValueChangedEventArgs> ValueChanged

{

add

{

if (_listenerCount == 0)

{

// fired when user selects item from list or presses Enter

ComboItem.Click += combo_Click;

// fired when user selects item from list or changes it with mouse wheel

ComboItem.TextBoxValueChange += (s, e) => FireValueChanged(e.NewValue);

}

_valueChanged += value;

_listenerCount++;

}

remove

{

_listenerCount--;

if (_listenerCount == 0)

{

EventHelper.RemoveEventHandler(ComboItem, "Click");

EventHelper.RemoveEventHandler(ComboItem, "TextBoxValueChange");

}

_valueChanged -= value;

}

public void Focus()

{

ComboItem.Focus();

}

public override string Text

{

get { return ComboItem.TextBoxValue; }

set { ComboItem.TextBoxValue = value; }

}

MapWindow5/src/MW5.UI/Menu/ComboBoxMenuItem.cs at develop · MapWindow/MapWindow5 · GitHub

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