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// 25 july 2014
package ui
import (
"unsafe"
)
// #include "winapi_windows.h"
import "C"
/*
On Windows, container controls are just regular controls; their children have to be children of the parent window, and changing the contents of a switching container (such as a tab control) must be done manually. Mind the odd code here.
TODO
- make sure all tabs cannot be deselected (that is, make sure the current tab can never have index -1)
- make sure tabs initially show the right control
*/
type tab struct {
*widgetbase
tabs []Control
}
func newTab() Tab {
w := newWidget(C.xWC_TABCONTROL,
C.TCS_TOOLTIPS | C.WS_TABSTOP,
0)
t := &tab{
widgetbase: w,
}
C.controlSetControlFont(w.hwnd)
C.setTabSubclass(w.hwnd, unsafe.Pointer(t))
return t
}
func (t *tab) setParent(win C.HWND) {
t.widgetbase.setParent(win)
for _, c := range t.tabs {
c.setParent(win)
}
}
func (t *tab) Append(name string, control Control) {
t.tabs = append(t.tabs, control)
if t.parent != nil {
control.setParent(t.parent)
}
C.tabAppend(t.hwnd, toUTF16(name))
}
//export tabChanging
func tabChanging(data unsafe.Pointer, current C.LRESULT) {
t := (*tab)(data)
t.tabs[int(current)].containerHide()
}
//export tabChanged
func tabChanged(data unsafe.Pointer, new C.LRESULT) {
t := (*tab)(data)
t.tabs[int(new)].containerShow()
}
// a tab control contains other controls; size appropriately
func (t *tab) allocate(x int, y int, width int, height int, d *sizing) []*allocation {
var r C.RECT
// first, append the tab control itself
a := t.widgetbase.allocate(x, y, width, height, d)
// now figure out what the rect for each child is
r.left = C.LONG(x) // load rect with existing values
r.top = C.LONG(y)
r.right = C.LONG(x + width)
r.bottom = C.LONG(y + height)
C.tabGetContentRect(t.hwnd, &r)
// and allocate
// don't allocate to just hte current tab; allocate to all tabs!
for _, c := range t.tabs {
a = append(a, c.allocate(int(r.left), int(r.top), int(r.right - r.left), int(r.bottom - r.top), d)...)
}
return a
}
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