Image gets lost with orientation change

[HARRY]

Erel,

I create a form on the desk top in landscape orientation; before running the program (A) on the device I set, manually, the screen orientation to landscape. I show an image by some click. It works fine.

Now I change the orientation either manually or I start in addition another program which also changes the orientation. Returning to program A the image ist lost and also cannot be shown again.

It sounds complicated, therefore I have attached a small program to illustrate the problem.

Can you explain these strange things and do you see a solution?

Harry

 

[Erel]

Using the FormLib library you can catch the Resize event.
You must add a FormLib object to your form if you want to handle screen orientations.

 

[HARRY]

Erel,

As you can see in the test program I sent with the post, there is a FormLib object and the screen orientation change event is caught.

Harry

 

[Cableguy]

Hi,

Im not an expert in this isue, if any, but in the resize event you should test the witdh and height of the form and re-position it in the form.
The resize event alone doe not change the form item position, it only allows you to execute code on the resize event...

 

[HARRY]

Paulo,

In the test program I just have one small image positioned in the middel of the screen. Whatever the orientation is, it should be visible without repositioning.

I worked with and without the resize event. Using the resize event I refreshed the destination rectangel.

But even loading the image again does't show the image.

Harry

 

[Erel]

As Cableguy wrote you should use the Resize event to draw (not refresh) the image again.
All the previous drawings are erased when the user changes the screen orientation.

 

[HARRY]

Hi,

Use of the DrawImage method does not improve the situation. I have attached a somewhat more elaborated test program. Running it you will see the problem. The image cannot be made visible again by (re)drawing it in the resize event nor on a second click on the form. Worst is that I don't see a work around.

Harry

 

[Erel]

You are right there is an issue when you combine a Drawer object and the resize event.
When the resize event fires a new bitmap is created for the form.
The solution is to recreate the drawer object again:

Sub Globals

End Sub

Sub App_Start
    Form1.Show
    flb1.New1("Form1",B4PObject(1))
    bm1.New1(Apppath & "\Dummy2.bmp")
    drawer1.New1("Form1",false)
    rectsrc.New1(0,0,320,240)    
    rectdes.New1(100,125,80,60)
    flb1.FullScreen(false) 'this will remove the menu bar and raise the resize event (the screen size changes).
End Sub

Sub flb1_resize
    if Form1.Width > Form1.Height then
        msgbox("Landscape")
    else
        msgbox("Portrait")
    end if
    drawer1.New1("form1",false)
    drawer1.DrawImage1(bm1.Value,rectsrc.Value,rectdes.Value,true)
    drawer1.Refresh2(rectdes.Value)
End Sub    
    

Sub Form1_MouseUp (x,y)
    msgbox ("Form clicked")
    drawer1.DrawImage1(bm1.Value,rectsrc.Value,rectdes.Value,true)
    drawer1.Refresh2(rectdes.Value)
End Sub