Bryan Bui-Tuong wrote:
> Never mind,
>
> Did some more research and found it on the wiki:
>
> Fill LiteBox with a Specific Color:
>
> static DFBResult FillBox(LiteBox *box, DFBColor *color)
> {
> DFBResult res = DFB_OK;
> IDirectFBSurface *s = box->surface;
>
> res = s->SetColor(s, color->r, color->g, color->b, color->a);
> res = s->FillRectangle(s, box->rect.x, box->rect.y, box->rect.w,
> box->rect.h);
> res = s->Flip(s, NULL, 0);
>
> return res;
> }
>
> Note that this will immediately call Flip and thus force the update. In case
> you want to collect all changes, do not call Flip at this instance. It's
> generally better to put code like this into your Draw callback for a LiTEBox
> and wait until it's called by a window update.
>
>
> One thing I'm not sure how to do is to set a Draw callback for a LiteBox, I
> will have to do some further reading on that.
Have a look at the various widgets in LiTE/lite, e.g. slider.c:
static DFBResult
draw_slider(LiteBox *box,
const DFBRegion *region,
DFBBoolean clear)
{
IDirectFBSurface *surface = box->surface;
LiteSlider *slider = LITE_SLIDER(box);
int h2 = box->rect.h / 2;
int w2 = box->rect.w / 2;
int pos = (int) (slider->pos * (box->rect.w-5)) + 2;
int posw = (int) (slider->pos * (box->rect.h));
D_ASSERT(box != NULL);
/**** USUAL CLIP *****/
surface->SetClip(surface, region);
/**** USUAL CLEAR *****/
/* Fill the background */
if (clear)
lite_clear_box(box, region);
/**** CUSTOM DRAWING CODE ****/
surface->SetDrawingFlags (surface, DSDRAW_NOFX);
if(slider->vertical) {
/* Draw vertical line */
surface->SetColor (surface, 0xe0, 0xe0, 0xe0, 0xff);
surface->DrawRectangle (surface, w2 - 3, 0, 8, box->rect.h);
surface->SetColor (surface, 0xb0, 0xb0, 0xb0, 0xff);
surface->DrawRectangle (surface, w2 - 2, 1, 6 , box->rect.h - 2);
if (box->is_focused)
surface->SetColor (surface, 0xc0, 0xc0, 0xff, 0xf0);
else
surface->SetColor (surface, 0xf0, 0xf0, 0xf0, 0xd0);
surface->FillRectangle (surface, w2 - 1, 2, 4, box->rect.h - 4);
/* Draw the position indicator */
surface->SetDrawingFlags (surface, DSDRAW_BLEND);
surface->SetColor (surface, 0x80, 0x80, 0xa0, 0xe0);
surface->FillRectangle (surface, 0, posw-1, box->rect.w, 1);
surface->FillRectangle (surface, 0, posw+1, box->rect.w,1);
surface->SetColor (surface, 0xb0, 0xb0, 0xc0, 0xff);
surface->FillRectangle (surface, 0, posw, box->rect.w, 1);
}
else {
/* Draw horizontal line */
surface->SetColor (surface, 0xe0, 0xe0, 0xe0, 0xff);
surface->DrawRectangle (surface, 0, h2 - 3, box->rect.w, 8);
surface->SetColor (surface, 0xb0, 0xb0, 0xb0, 0xff);
surface->DrawRectangle (surface, 1, h2 - 2, box->rect.w - 2, 6);
if (box->is_focused)
surface->SetColor (surface, 0xc0, 0xc0, 0xff, 0xf0);
else
surface->SetColor (surface, 0xf0, 0xf0, 0xf0, 0xd0);
surface->FillRectangle (surface, 2, h2 - 1, box->rect.w - 4, 4);
/* Draw the position indicator */
surface->SetDrawingFlags (surface, DSDRAW_BLEND);
surface->SetColor (surface, 0x80, 0x80, 0xa0, 0xe0);
surface->FillRectangle (surface, pos-1, 0, 1, box->rect.h);
surface->FillRectangle (surface, pos+1, 0, 1, box->rect.h);
surface->SetColor (surface, 0xb0, 0xb0, 0xc0, 0xff);
surface->FillRectangle (surface, pos, 0, 1, box->rect.h);
}
return DFB_OK;
}
Such a callback is registered at widget's creation time:
DFBResult
lite_new_slider(LiteBox *parent,
DFBRectangle *rect,
LiteSliderTheme *theme,
LiteSlider **ret_slider)
{
DFBResult res;
LiteSlider *slider = NULL;
slider = D_CALLOC(1, sizeof(LiteSlider));
slider->box.parent = parent;
slider->theme = theme;
slider->box.rect = *rect;
res = lite_init_box(LITE_BOX(slider));
if (res != DFB_OK) {
D_FREE(slider);
return res;
}
slider->box.type = LITE_TYPE_SLIDER;
slider->box.Draw = draw_slider; <============ HERE
slider->box.Destroy = destroy_slider;
slider->box.OnEnter = on_enter;
slider->box.OnFocusIn = on_focus_in;
slider->box.OnFocusOut = on_focus_out;
slider->box.OnButtonDown = on_button_down;
slider->box.OnMotion = on_motion;
slider->vertical=(slider->box.rect.h > slider->box.rect.w) ? true : false;
lite_update_box(LITE_BOX(slider), NULL);
*ret_slider = slider;
D_DEBUG_AT(LiteSliderDomain, "Created new slider object: %p\n", slider);
return DFB_OK;
}
--
Best regards,
Denis Oliver Kropp
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| http://www.directfb.org/ |
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