mirror of
https://github.com/xcp-ng/xenadmin.git
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113 lines
4.2 KiB
C#
113 lines
4.2 KiB
C#
/* Copyright (c) Cloud Software Group, Inc.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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using System;
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using System.Windows.Forms;
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using XenAdmin.Core;
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namespace XenAdmin.Controls
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{
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/// <summary>
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/// A combobox that automatically resizes the dropdown's width to be as big
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/// as the longest string in the items list
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/// </summary>
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public partial class LongStringComboBox : ComboBox
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{
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static int MAX_WIDTH = 1000;
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public LongStringComboBox()
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{
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InitializeComponent();
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}
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protected override void OnDropDown(EventArgs e)
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{
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int totalWidth = MeasureLongestItem + VerticalScrollBarWidth;
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DropDownWidth = totalWidth > Width ? totalWidth : Width;
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if (DropDownWidth > MAX_WIDTH)
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DropDownWidth = MAX_WIDTH;
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base.OnDropDown(e);
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}
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protected override void OnCreateControl()
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{
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// Some strings can be very long, so we will show the value as a mouse over tooltip.
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// Initialize the tooltip here.
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toolTip.Active = true;
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toolTip.AutomaticDelay = 0;
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toolTip.AutoPopDelay = 50000;
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toolTip.InitialDelay = 50;
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toolTip.ReshowDelay = 50;
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toolTip.ShowAlways = true;
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base.OnCreateControl();
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}
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private int MeasureLongestItem
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{
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get
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{
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int longest = 0;
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foreach (var item in Items)
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{
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//CA-113310: use TextRenderer rather than Graphics to measure
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//the string because it will be placed on a winforms control
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//with the default UseCompatibleTextRendering value (false)
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int stringLength = TextRenderer.MeasureText(item.ToString(), Font).Width;
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if (stringLength > longest)
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longest = stringLength;
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}
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return longest;
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}
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}
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private int VerticalScrollBarWidth
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{
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get { return Items.Count > MaxDropDownItems ? SystemInformation.VerticalScrollBarWidth : 0; }
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}
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private const int DropDownButtonWidth = 10;
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protected override void OnSelectedIndexChanged(EventArgs e)
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{
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string itemText = SelectedItem != null ? SelectedItem.ToString() : string.Empty;
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int width = Drawing.MeasureText(itemText, Font).Width;
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int selectedItemTextWidth = !string.IsNullOrEmpty(itemText)
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? width + DropDownButtonWidth
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: 0;
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toolTip.SetToolTip(this, selectedItemTextWidth > ClientRectangle.Width ? itemText : string.Empty);
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base.OnSelectedIndexChanged(e);
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}
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}
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}
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