/// <summary>
/// 当用户点击分页编号按钮时引发此事件。
/// </summary>
/// <param name="sender">分页按钮对象。</param>
/// <param name="e">默认的时间数据。</param>
private void PageNumberButton_Click(object sender, EventArgs e)
{
PageNumberButton btn = sender as PageNumberButton;
//this.PageIndex = btn.PageNumber - 1;
this.DoPageIndexChanging(btn.PageNumber - 1);
}
/// <summary>
/// 更新显示的分页按钮。
/// </summary>
/// <param name="ABS">是否强制更新分页页码按钮。</param>
private void RefreshPageNumberButtons(bool ABS)
{
int startPageIndex = this.PageIndex - this.PageGroupSize / 2;
if (startPageIndex + this.PageGroupSize > this.PagesCount - 1)
{
startPageIndex = this.PagesCount - this.PageGroupSize;
}
if (startPageIndex < 0)
{
startPageIndex = 0;
}
this.FirstPageButton.Enabled = this.PreviousPageGroupButton.Enabled = this.PreviousPageButton.Enabled = (this.PageIndex > 0);
this.LastPageButton.Enabled = this.NextPageGroupButton.Enabled = this.NextPageButton.Enabled = (this.PageIndex < this.PagesCount - 1);
bool ReCreatePageNumberButtons = true; //指示是否需要重新设置分页编号按钮。
#region 判断是否需要重新设置分页编号按钮。
if (!ABS && this._ShowPageNumberButtons)
{
#region 找到当前显示的最大分页编号和最小分页编号。
int curSPI = 0; //最小分页编号。
int curMPI = 0; //最大分页编号。
bool first = true;
foreach (var tmp in this.Items)
{
if (tmp is PageNumberButton || tmp is CurrentPageNumberButton)
{
int k;
if (tmp is PageNumberButton)
{
k = ((PageNumberButton)tmp).PageNumber - 1;
}
else// if (tmp is CurrentPageNumberButton)
{
k = ((CurrentPageNumberButton)tmp).PageNumber - 1;
}
if (first)
{
first = false;
curSPI = k;
curMPI = k;
}
else
{
if (k < curSPI)
{
curSPI = k;
}
else if (k > curMPI)
{
curMPI = k;
}
}
}
}
#endregion
if (!first) //如果 first 发生反转则执行重新生成分页编号按钮的判断。
{
int jj = startPageIndex + this.PageGroupSize - 1;
if (jj >= this.PagesCount)
{
jj = this.PagesCount - 1;
}
if (curSPI == startPageIndex && curMPI == jj)
{
ReCreatePageNumberButtons = false;
}
}
}
#endregion
#region 重新生成页码按钮。
if (!this._ShowPageNumberButtons || ReCreatePageNumberButtons) //当不显示分页编码按钮或需要重新创建分页编码按钮时，需要清除已存在的分页编码按钮。
{
this.ClearPageNumberButton();
}
if (this._ShowPageNumberButtons && ReCreatePageNumberButtons)
{
int insertIndex = this.Items.IndexOf(this.NextPageButton); //计算记录插入位置。
for (int i = startPageIndex; i < startPageIndex + this.PageGroupSize && i < this.PagesCount; i++)
{
if (i == this.PageIndex) //当前分页。
{
CurrentPageNumberButton btn = new CurrentPageNumberButton();
btn.ForeColor = this.CurrentPageButtonForColor;
btn.BackColor = this.CurrentPageButtonBackColor;
btn.Font = this.CurrentPageButtonFont;
btn.Text = (i + 1).ToString();
btn.ToolTipText = string.Format("第 {0} 页", i + 1);
this.Items.Insert(insertIndex++, btn);
}
else
{
PageNumberButton btn = new PageNumberButton(i + 1);
btn.ToolTipText = string.Format("第 {0} 页", i + 1);
btn.Click += new EventHandler(this.PageNumberButton_Click);
this.Items.Insert(insertIndex++, btn);
}
}
}
#endregion
int crc = this.PageSize; //当前页记录总数
if (this.RecordsCount <= this.PageSize * (this.PageIndex + 1)) //如果尾页则需要统计记录实际数量。
{
crc = this.RecordsCount - this.PageSize * this.PageIndex;
}
if (crc < 0)
{
crc = 0;
}
this._PageSizeLabel.Text = string.Format(this.PageSizeLabelFormatString, crc);
this._RecordsCountLabel.Text = string.Format(this.RecordsCountLabelFormatString, this.RecordsCount);
this._PageIndexLabel.Text = string.Format(this.PageIndexLabelFormatString, this.PageIndex + 1);
this._PagesCountLabel.Text = string.Format(this.PagesCountLabelFormatString, this.PagesCount);
#region 调整当前分页说明标签的位置，以满足按钮项目的布局合理性。
if (this.ShowPageIndexLabel && !this.ShowPageNumberButtons)
{
this.Items.Remove(this._PageIndexLabel);
int insertIndex = this.Items.IndexOf(this._NextPageButton);
if (insertIndex != -1)
{
this.Items.Insert(insertIndex, this._PageIndexLabel);
}
}
else
{
this.Items.Remove(this._PageIndexLabel);
int insertIndex = this.Items.IndexOf(this._PagesCountLabel);
if (insertIndex != -1)
{
this.Items.Insert(insertIndex, this._PageIndexLabel);
}
}
#endregion
this.FixItemsPosition();
}
