86 lines
2.5 KiB
C#
86 lines
2.5 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Drawing;
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namespace Sheng.Winform.Controls
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{
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/// <summary>
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/// 默认渲染器，以类似微软ListView的方式按行绘制项，只绘制简单的文本
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/// </summary>
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class ShengListViewStandardRenderer : ShengListViewRenderer
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{
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#region 私有成员
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/// <summary>
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/// 字的高度是否已初始化
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/// 在第一次绘制时，测量文本的高度
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/// </summary>
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bool _headerHeightInited = false;
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int _headerHeight;
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Size _itemPadding = new Size(8, 4);
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Rectangle _headerBounds;
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StringFormat _itemHeaderStringFormat = new StringFormat();
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#endregion
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#region 构造
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public ShengListViewStandardRenderer(ShengListViewLayoutManager layoutManager)
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: base(layoutManager)
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{
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layoutManager.ItemHeight = 24;
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//_itemHeaderStringFormat.Alignment = StringAlignment.Center;
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_itemHeaderStringFormat.FormatFlags = StringFormatFlags.LineLimit| StringFormatFlags.NoWrap;
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}
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#endregion
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#region 受保护的方法
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internal override void DrawForeground(Graphics g)
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{
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}
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internal override void DrawItemContent(Graphics g, Rectangle bounds, ShengListViewItem item)
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{
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string header = LayoutManager.GetItemText(item.Value);
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if (String.IsNullOrEmpty(header))
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return;
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if (_headerHeightInited == false)
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{
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SizeF headerSize = g.MeasureString(header, Theme.ItemHeaderFont);
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_headerHeight = (int)Math.Ceiling(headerSize.Height);
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_headerHeightInited = true;
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}
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#region 绘制文本
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_headerBounds = new Rectangle();
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_headerBounds.X = _itemPadding.Width;
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_headerBounds.Y = _itemPadding.Height;
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_headerBounds.Width = bounds.Width;
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_headerBounds.Height = _headerHeight;
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_headerBounds.Offset(bounds.Location);
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if (String.IsNullOrEmpty(header) == false)
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{
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using (SolidBrush brush = new SolidBrush(Theme.ItemHeaderColor))
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{
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g.DrawString(header, Theme.ItemHeaderFont, brush, _headerBounds, _itemHeaderStringFormat);
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}
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}
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#endregion
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}
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#endregion
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}
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}
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