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Home » U++ Library support » U++ Widgets - General questions or Mixed problems » WindowProc invoked while in Paint routine
WindowProc invoked while in Paint routine [message #40362] Wed, 24 July 2013 22:23 Go to next message
NeilMonday is currently offline  NeilMonday
Messages: 15
Registered: May 2013
Promising Member
I asked this in the newbie forum, but did not receive much of a response, so I thought I would try posting here.

I have an error, and cannot track down the solution. My application keeps asserting on line 86 of Win32Proc.cpp when I click on an Option control:

ASSERT_(!painting, "WindowProc invoked while in Paint routine");

I imagine this is because something is taking a long time to paint, or because `painting` is not being set to false when it is done.

This happens when I check a checkbox on a custom control, but there is nothing in the stack trace that references one of my classes.

Here is the stack trace:
Upp::Ctrl::WindowProc(533, 0, 0)
Upp::TopWindow::WindowProc(533, 0, 0)
Upp::Ctrl::WindowProc(hWnd, 533, 0, 0)
Upp::Ctrl::Refresh(x=17129912, y=1997078640, cx=22383264, cy=0);
_|find(key=0, base=1056210...)

This _|find() entry shows up in the stack trace about 14 times and is then followed by more Upp::Ctrl and Upp::Callbacks.

I am not really sure what else to post, so let me know what other info you would like to see. I am a bit lost here.

Here is some of my code:
First, here are a couple of helper classes that I am using:

class OptionWithKey : public Option
    typedef OptionWithKey CLASSNAME;

    Callback1<int> WhenOptionWithKey;

    DEF_VAR(OptionWithKey&, Key, int, key, *this);

    OptionWithKey() : key(-1)  { WhenAction = THISBACK(OnOptionAction); }

    void OnOptionAction()  { WhenOptionWithKey(key); }

class OptionWithKeyArrayMap : public ArrayMap<int, OptionWithKey>
    typedef OptionWithKeyArrayMap CLASSNAME;

    Callback1<int> WhenOption;

    OptionWithKey& Add(int key)
        OptionWithKey& option = ArrayMap<int, OptionWithKey>::Add(key);
        option.WhenOptionWithKey = THISBACK(OnOptionAction);
        return option;

    void OnOptionAction(int key)  { WhenOption(key); }

I have a class that inherits from ChartCtrl called ANBarGraph:

class ANBarGraph : public ChartCtrl
    typedef ANBarGraph CLASSNAME;


    OptionWithKeyArrayMap  instructorOptionArray;
    void OnInstructorTrigger(int key);


In the constructor, I set the callback for the instructorOptionArray:

    instructorOptionArray.WhenOption = THISBACK(OnInstructorTrigger);

I have a SetData function that sets up the instructorOptionArray:

void ANBarGraph::SetData(...)
    if (instructorOptionArray.Find(baseKey) < 0)
        OptionWithKey& option = instructorOptionArray.Add(baseKey);
        option.Set(0).NoNotNull().SetLabel(t_("Instructor trigger")).SetFont(SansSerif(14)).SetFrame(ThinInsetFrame());
    if (instructorOptionArray.Find(groupKey) < 0)
        OptionWithKey& option = instructorOptionArray.Add(groupKey);
        groupInfo.triggerState = ATaS::ANGroupInfo::TriggerState(int(instructorOptionArray.Get(groupKey)));

I have found out that the problem happens in between the Pusher::LeftDown() and Pusher::LeftUp(). If I click the checkbox and hold the left mouse button down, the ASSERT gets hit before I release the mouse button.

I have a breakpoint set in "OnInstructorTrigger(int key)" function, but when I click the checkbox, it hits the ASSERT before it gets to the callback.

One thing that I saw that was strange is that the Refresh call always has huge numbers for x, y, and cx. While cy is always 0.
Re: WindowProc invoked while in Paint routine [message #40387 is a reply to message #40362] Mon, 29 July 2013 19:38 Go to previous message
mirek is currently offline  mirek
Messages: 13996
Registered: November 2005
Ultimate Member
Well, this happens when you start message processing from Paint routine.

Typical example:

void MyApp::Paint(Draw& w)
    Progress pi;
    for(....) {

The problem is that Win32 (not U++) does not handle this well, that is why it is checked.

While above example might seem obvious, I usually hit this error if Paint uses some sort of cached/lazy loaded data and loading of this data attempts to show the progress.

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