alema/ugui.c3l
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

correct placement and box model

Browse source
This commit is contained in:
Alessandro Mauri 2024-11-14 23:42:20 +01:00
parent 250a0fb3b5
commit 763e9ba8d6
5 changed files with 85 additions and 42 deletions
Download patch file Download diff file Expand all files Collapse all files

97
src/ugui_layout.c3
View file

@ -75,9 +75,12 @@ fn void! Ctx.layout_next_column(&ctx)
}
// position the rectangle inside the parent according to the layout
// parent: parent div
// rect: the requested size
// style: apply style
fn Rect Ctx.position_element(&ctx, Elem *parent, Rect rect, bool style = false)
{
Rect bounds;
Rect placement;
Point origin;
// 1. Select the right origin
@ -91,49 +94,65 @@ fn Rect Ctx.position_element(&ctx, Elem *parent, Rect rect, bool style = false)
// Error
}
// 2. Position the rect
bounds.x = (short)max(origin.x + rect.x, 0);
bounds.y = (short)max(origin.y + rect.y, 0);
// the bottom-right border of the element box
Point pl_corner;
// 3. Calculate width & height
// FIXME: account for origin offset!!
bounds.w = rect.w > 0 ? rect.w : parent.bounds.w;
bounds.h = rect.h > 0 ? rect.h : parent.bounds.h;
// 2. Calculate the placement
placement.x = (short)max(origin.x + rect.x, 0);
placement.y = (short)max(origin.y + rect.y, 0);
placement.w = rect.w > 0 ? rect.w : parent.bounds.w - (placement.x - parent.bounds.x);
placement.h = rect.h > 0 ? rect.h : parent.bounds.h - (placement.y - parent.bounds.y);
// 4. Update the origins of the parent
parent.div.origin_r = Point{
.x = bounds.x + bounds.w,
.y = bounds.y,
};
parent.div.origin_c = Point{
.x = bounds.x,
.y = bounds.y + bounds.h,
};
pl_corner.x = placement.x + placement.w;
pl_corner.y = placement.y + placement.h;
// if using the style then apply margins
// FIXME: this does not work
if (style && parent.div.layout != LAYOUT_FLOATING) {
bounds.x += ctx.style.margin.x;
bounds.y += ctx.style.margin.y;
// 2.1 apply style, css box model
if (style) {
Rect margin = ctx.style.margin;
Rect border = ctx.style.border;
Rect padding = ctx.style.padding;
// total keep-out borders
Rect margin_tot = {
.x = ctx.style.padding.x + ctx.style.border.x +
ctx.style.margin.x,
.y = ctx.style.padding.y + ctx.style.border.y +
ctx.style.margin.y,
.w = ctx.style.padding.w + ctx.style.border.x +
ctx.style.margin.w,
.h = ctx.style.padding.h + ctx.style.border.x +
ctx.style.margin.h,
};
placement.x += margin.x;
placement.y += margin.y;
if (rect.w != 0) { placement.w += margin.x+margin.w + padding.x+padding.w; }
if (rect.h != 0) { placement.h += margin.y+margin.h + padding.y+padding.h; }
parent.div.origin_r.x += margin_tot.x + margin_tot.w;
// parent.div.origin_r.y += margin_tot.h;
// parent.div.origin_c.x += margin_tot.w;
parent.div.origin_c.y += margin_tot.y + margin_tot.h;
pl_corner.x = placement.x + placement.w + margin.w;
pl_corner.y = placement.y + placement.h + margin.h;
}
return bounds;
// 3. Update the origins of the parent
parent.div.origin_r = Point{
.x = pl_corner.x,
.y = origin.y,
};
parent.div.origin_c = Point{
.x = origin.x,
.y = pl_corner.y,
};
// 4. Calculate the "scrolled" view
Point off;
if (parent.div.can_scroll_x && parent.div.horizontal_scroll_bar != -1) {
Elem*! sx = ctx.get_elem_by_tree_idx(parent.div.horizontal_scroll_bar);
if (catch sx) { return Rect{}; }
// TODO: assert that the element is a slider
off.x = (short)(parent.div.children_bounds.w * sx.slider.value);
}
if (parent.div.can_scroll_y && parent.div.vertical_scroll_bar != -1) {
Elem*! sy = ctx.get_elem_by_tree_idx(parent.div.vertical_scroll_bar);
if (catch sy) { return Rect{}; }
// TODO: assert that the element is a slider
off.y = (short)(parent.div.children_bounds.h * sy.slider.value);
}
Rect view = {
.x = parent.bounds.x + off.x,
.y = parent.bounds.y + off.y,
.w = parent.bounds.w,
.h = parent.bounds.h,
};
// TODO: 5. check if the placement is inside the view
return placement;
}