我想创建一个使用本机进度条渲染的DataGridView进度条。我目前有自定义绘制逻辑来实现这一点，但它看起来不太好。
答案 0 :(得分：2)
好的，我发现至少有一种方法可以做到这一点。我有一个ProgressBar成员变量，我将它绘制到Cell的Paint逻辑中的位图，然后让单元格绘制位图。实际上棘手的部分是动画细胞。可能有更好的方法，但这里有完整的，可用的代码：
//
// $Id: DataGridViewProgressBar.cs 2051 2010-06-15 18:39:13Z chambm $
//
//
// Original author: Jay Holman <jay.holman .@. vanderbilt.edu>
//
// Copyright 2011 Vanderbilt University - Nashville, TN 37232
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
using System;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;
namespace CustomProgressCell
{
public sealed class DataGridViewProgressColumn : DataGridViewColumn
{
public DataGridViewProgressColumn()
{
CellTemplate = new DataGridViewProgressCell();
}
}
}
namespace CustomProgressCell
{
sealed class DataGridViewProgressCell : DataGridViewTextBoxCell
{
#region Public data accessors
/// <summary>
/// Gets or sets the progress bar's Maximum property.
/// </summary>
public int Maximum
{
get { return _progressBar.Maximum; }
set { _progressBar.Maximum = value; startAnimation(); }
}
/// <summary>
/// Gets or sets the progress bar's Minimum property.
/// </summary>
public int Minimum
{
get { return _progressBar.Minimum; }
set { _progressBar.Minimum = value; startAnimation(); }
}
/// <summary>
/// Gets or sets the text to display on top of the progress bar.
/// </summary>
public string Text
{
get { return _text; }
set { _text = value; refresh(); }
}
/// <summary>
/// Gets or sets the progress bar's drawing style.
/// </summary>
public ProgressBarStyle ProgressBarStyle
{
get { return _progressBar.Style; }
set { _progressBar.Style = value; startAnimation(); }
}
#endregion
/// <summary>
/// Use these keywords in the Text property to their respective values in the text.
/// </summary>
public abstract class MessageSpecialValue
{
public const string Minimum = "<<Minimum>>";
public const string Maximum = "<<Maximum>>";
public const string CurrentValue = "<<CurrentValue>>";
}
#region Private member variables
ProgressBar _progressBar;
Timer _animationStepTimer;
Timer _animationStopTimer;
string _text;
#endregion
public DataGridViewProgressCell()
{
_progressBar = new ProgressBar()
{
Minimum = 0,
Maximum = 100,
Style = ProgressBarStyle.Continuous
};
_text = String.Format("{0} of {1}", MessageSpecialValue.CurrentValue, MessageSpecialValue.Maximum);
ValueType = typeof(int);
// repaint every 25 milliseconds while progress is active
_animationStepTimer = new Timer { Interval = 25, Enabled = true };
// stop repainting 1 second after progress becomes inactive
_animationStopTimer = new Timer { Interval = 1000, Enabled = false };
_animationStepTimer.Tick += (x, y) => { stopAnimation(); refresh(); };
_animationStopTimer.Tick += (x, y) => { _animationStepTimer.Stop(); _animationStopTimer.Stop(); };
}
protected override object GetValue (int rowIndex)
{
return _progressBar.Value;
}
protected override bool SetValue (int rowIndex, object value)
{
if (value is int)
{
_progressBar.Value = (int) value;
refresh();
return true;
}
return false;
}
protected override void Paint (Graphics g, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
{
ReadOnly = true;
// Draw the cell border
base.Paint(g, clipBounds, cellBounds,
rowIndex, cellState, value, formattedValue, errorText,
cellStyle, advancedBorderStyle, DataGridViewPaintParts.Border);
try
{
// Draw the ProgressBar to an in-memory bitmap
Bitmap bmp = new Bitmap(cellBounds.Width, cellBounds.Height);
Rectangle bmpBounds = new Rectangle(0, 0, cellBounds.Width, cellBounds.Height);
_progressBar.Size = cellBounds.Size;
_progressBar.DrawToBitmap(bmp, bmpBounds);
// Draw the bitmap on the cell
g.DrawImage(bmp, cellBounds);
// Replace special value placeholders
var editedMessage = _text.Replace(MessageSpecialValue.CurrentValue, Value.ToString())
.Replace(MessageSpecialValue.Maximum, Maximum.ToString())
.Replace(MessageSpecialValue.Minimum, Minimum.ToString());
// Write text over bar
base.Paint(g, clipBounds, cellBounds,
rowIndex, cellState, value, editedMessage, errorText,
cellStyle, advancedBorderStyle, DataGridViewPaintParts.ContentForeground);
}
catch (ArgumentOutOfRangeException)
{
// Row probably couldn't be accessed
}
}
private void refresh ()
{
if (DataGridView != null) DataGridView.InvalidateCell(this);
}
private void startAnimation ()
{
if (_progressBar.Style == ProgressBarStyle.Marquee ||
(_progressBar.Value > _progressBar.Minimum && _progressBar.Value < _progressBar.Maximum))
_animationStepTimer.Start();
}
private void stopAnimation ()
{
if (_progressBar.Style != ProgressBarStyle.Marquee &&
(_progressBar.Value == _progressBar.Minimum || _progressBar.Value == _progressBar.Maximum))
_animationStopTimer.Start();
}
}
}
答案 1 :(得分：1)
您可以在DataGridView单元格内托管您想要的任何控件。 MSDN上提供了完整的示例：How to: Host Controls in Windows Forms DataGridView Cells
所以你可以使用内置的ProgressBar control，它看起来就像原生一样。
要回答关于自定义DataGridViewImageCell的绘制逻辑以使其像进度条一样绘制的其他问题，它取决于您正在讨论的本地进度条渲染。直到Windows Aero使用的一个非常简单 - 它只是一个填充系统高亮颜色的实心矩形。重新实现该控件的绘制逻辑是微不足道的。这就是the article Jay links to试图做的事情。它不是很正确 - 红色文本在绿色背景上看起来很难看。如果您打算以正确的方式执行此操作，填充颜色将是系统突出显示颜色，百分比将是系统WindowText颜色。
但是以航空为主题的进度条看起来完全不同。对于初学者来说，它们是绿色的，渐变填充的，并且具有悸动效果。在WinForms中重现并不是特别容易。我浪费了很多时间尝试一个项目很长一段时间，但我放弃了因为它不太相同。你可以开始使用LinearGradientBrush，但它永远不会看起来完全一样。你仍然不会有脉冲和悸动的影响。除了严格的视觉外观外，Aero进度条还具有漂亮的子步插值和其他动画效果，这些效果将更难以重新创建。我的诚实意见是，这不值得付出努力，特别是在使用实际进度条控件时非常容易。
如果你已经死定了，这里有一个示例控件来帮助你入门：Vista Style Progress Bar in C#。
当用户禁用Aero主题，或者在旧版Windows（如XP）上运行时，请确保您具有可回溯到经典样式呈现的逻辑。