一个简单的程序如下:
BOOL CATLVCXSHueSet::OnInitDialog()
{
CDialog::OnInitDialog();
m_HueSetSliderCtrl.SetRange(-15,15);
m_HueSetSliderCtrl.SetLineSize(0);
m_HueSetSliderCtrl.SetPos(0);
m_SatSetSliderCtrl.SetRange(75,125);
m_SatSetSliderCtrl.SetLineSize(1);
m_SatSetSliderCtrl.SetPos(100);
m_LumSetSliderCtrl.SetRange(75,125);
m_LumSetSliderCtrl.SetLineSize(1);
m_LumSetSliderCtrl.SetPos(100);
UpdateWindow();
return TRUE;
}
发现第一个控件初始化位置失败,Slider依旧停在最左侧,后两个成功。查阅了MSDN后发现是SetRange(int min, int max)时缺省第三个参数导致没有重绘的问题。
解决如下:
BOOL CATLVCXSHueSet::OnInitDialog()
{
CDialog::OnInitDialog();
m_HueSetSliderCtrl.SetRange(-15,15, TRUE);
m_HueSetSliderCtrl.SetLineSize(0);
m_HueSetSliderCtrl.SetPos(0);
m_SatSetSliderCtrl.SetRange(75,125);
m_SatSetSliderCtrl.SetLineSize(1);
m_SatSetSliderCtrl.SetPos(100);
m_LumSetSliderCtrl.SetRange(75,125);
m_LumSetSliderCtrl.SetLineSize(1);
m_LumSetSliderCtrl.SetPos(100);
UpdateWindow();
return TRUE;
}
void SetRange( int nMin, int nMax, BOOL bRedraw = FALSE );
Parameters
nMin
Minimum position for the slider.
nMax
Maximum position for the slider.
bRedraw
The redraw flag. If this parameter is TRUE, the slider is redrawn after the range is set; otherwise the slider is not redrawn