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// 25 june 2014
package ui
type allocation struct {
x int
y int
width int
height int
this Control
neighbor Control
}
type sizingbase struct {
xmargin int
ymargin int
xpadding int
ypadding int
}
type controlSizing interface {
allocate(x int, y int, width int, height int, d *sizing) []*allocation
preferredSize(*sizing) (int, int)
commitResize(*allocation, *sizing)
getAuxResizeInfo(*sizing)
}
// A sizer hosts a Control and resizes that Control based on changes in size to the parent Window.
// sizer is used by Window, Tab, and [TODO implement] Group to contain and control their respective controls.
// Window is the beginning of the resize chain; resizes happen on the system side.
// Tab and Group are Controls and thus implement controlSizing; they should call their internal sizers's resize() method in their own commitResize().
type sizer struct {
child Control
}
// set to true to apply spacing to all windows
var spaced bool = false
func (c *sizer) resize(x, y, width, height int) {
if c.child == nil { // no children; nothing to do
return
}
d := c.beginResize()
allocations := c.child.allocate(x + d.xmargin, y + d.ymargin, width - (2 * d.xmargin), height - (2 * d.ymargin), d)
c.translateAllocationCoords(allocations, width, height)
// move in reverse so as to approximate right->left order so neighbors make sense
for i := len(allocations) - 1; i >= 0; i-- {
allocations[i].this.commitResize(allocations[i], d)
}
}
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