OnPaint is missng between MouseDown and MouseUp (C# Compact framework)

[pshilparani]

Hello All,

I am working with Device Application( Compact framework) C#

I have a class which creates grid with numbers on it some thing like shown below

------------
| 1 | 2 | 3 |
------------
| 4 | 5 | 6 |
------------
| 7 | 8 | 9 |
------------
| 0 |
------------

Each cell is Rectangle object ( Rectangle array drawn on panel)
I just want to highlight only the key clicked (same effect as in windows calculator - On mouse down color should change and on mouse up normal color should be displayed)

For this i am doing something like this

bool pushed;

OnMouseDown()
{
pushed = true;
Invalidate();
}

OnMouseUp()
{
pushed = false;
Invalidate();
}


OnPaint(...)
{
....... /// some code
if(pushed)
{
Fill the selected/clicked rectangle with different color
}

.........// some code
}


Problem facing:
For some clicks, key highlight don't work in device application( compact frame work). But in windows application it works properly !!!

Usually when i click on a key, the order should MouseDown -> Onpaint - > MouseUp [ Onpaint calling in middle because of Invalidate in mouse down]

But some times, this order goes wrong in device application [compact framework] like MouseDown -> MouseUp [ OnPaint is missed] Because of this click highlight doesn't work.

Any help on this?

[GaryTexmo]

Take this with a grain of salt because I've never developed in the compact framework before, but you might be able to manual force a paint on your mouse down and mouse up events.

I believe you can do with with the Invalidate() method.

[pshilparani]

Thanks for your reply GaryTexmo..

But calling Invalidate() in MouseDown event is not sufficient in WinCe environment [ Atleast in my case where i am trying paint specific region [rect] on a panel control ]. Because call to OnPaint by the Invalidate() will be ignored as soon i get MouseUp event.

I fixed this issue by forcing the paint by calling Update() in MouseDown event which will force immediate paint of invalidated regions like below.

OnMouseDown()
{
pushed = true;
Invalidate();
this.Update();
}