Creating Thin-Framed Splitter Windows


This article was contributed by Jens Winslow.

Environment: Windows and Dialogs, VC++

The credit for this solution goes to Markus Plaum, who was the one who actually figured out how to do this. Thanks, Markus.

While creating a program to draw a data view with a scale, using a splitter window with scale in top of the pane, and data in the bottom, I was frustrated in my inability to avoid the "fat" splitter border between the two view panes (and I did not want user to resize the scale view). After trying many approaches based on examples from books and CodeGuru, I was ready to give up. Luckily, a friend of mine had solved this problem in the past.

Somehow, he had determined that the CSplitterWnd class has several member variables that determine the frame of the splitter border. These do not appear to be documented, but if one steps through the constructor CSplitterWnd::CSplitterWnd() in ...MFC/Src\Winsplit.cpp, they are right there.

All I needed to do was to derive my own splitter class and modify these member variables to achieve my desired effect.

CThinFrameSplitterWnd : CSplitterWnd

CThinFrameSplitterWnd::CPaneSplitter()
{
  m_cxSplitter=PANE_BORDER;     // = 1
  m_cySplitter=PANE_BORDER;     // = 1
  m_cxBorderShare=PANE_SHARE;   // = 0
  m_cyBorderShare=PANE_SHARE;   // = 0
  m_cxSplitterGap=PANE_GAP;     // = 1
  m_cySplitterGap=PANE_GAP;     // = 1

}

Replacing the CSplitterWnd::HitTest(CPoint pt) const function allowed me to ignore the mouse position over the frame to avoid user resizing, which was both desired and necessary—my changes to m_cxSplitter and so forth cause an assertion if the user tries to resize.

int CThinFrameSplitterWnd::HitTest(CPoint /*pt*/) const
{
  ASSERT_VALID (this);
  return 0;       // don't let the user see the mouse hits
}

Below is an example where I have created a horizontal split frame (CChildFrame), with the left-hand frame having a scale_data splitter window, and the right-hand frame having two splitter windows, each with a scale_data splitter window. The right picture shows the effect of using CThinFrameSplitter instead of CSplitterWnd in a scale_data splitter window.



Click here for a larger image.

I hope this may save someone the time it took Markus and me to figure this out.

Jens Winslow



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Companies undertaking an IT project need to find the right balance between cost and functionality. It's important to start by determining whether to build a solution from scratch, buy an out-of-the-box solution, or a combination of both. In reality, most projects will require some system tailoring to meet business requirements. Decision-makers must understand how much software development is enough and craft a detailed implementation plan to ensure the project's success. This white paper examines the different …

  • Migrating away from Windows Server 2003 is an investment in your organization's future, and there has never been a better time to begin the migration process. Take the next step to transform your datacenter by upgrading your server platform with leading edge Windows Operating Systems and SanDisk flash solutions.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date