//工具条前五个按钮绑定的公共事件
private void selectToolButton_Click(object sender, EventArgs e)
{
ToolButton nowButton = sender as ToolButton;
plColorBox.Visible = nowButton.IsSelected;
tBtn_TextFont.Visible = fontBox.Visible = nowButton.Equals(btnText);
if (plColorBox.Visible)
{
imageProcessBox.CanReset = false;
}
else
{
imageProcessBox.CanReset = historyLayer.Count == 0;
}
this.SetToolBarLocation();
}