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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.
We'll create a dummy window using the pre-existing Window window class for each tab page. This makes showing and hiding tabs a matter of showing and hiding one control, at the cost of having to do C.moveWindow() in tab.commitResize()... (TODO)
TODO
- make sure all tabs cannot be deselected (that is, make sure the current tab can never have index -1)
*/
type tab struct {
_hwnd C.HWND
tabs []*layout
parent *controlParent
}
func newTab() Tab {
hwnd := C.newControl(C.xWC_TABCONTROL,
C.TCS_TOOLTIPS | C.WS_TABSTOP,
0)
t := &tab{
_hwnd: hwnd,
}
C.controlSetControlFont(t._hwnd)
C.setTabSubclass(t._hwnd, unsafe.Pointer(t))
return t
}
func (t *tab) Append(name string, control Control) {
l := newLayout("", 0, 0, C.TRUE, control)
t.tabs = append(t.tabs, l)
if t.parent != nil {
l.setParent(t.parent)
}
// initially hide tab 1..n controls; if we don't, they'll appear over other tabs, resulting in weird behavior
if len(t.tabs) != 1 {
// TODO move these calls to layout itself
C.ShowWindow(t.tabs[len(t.tabs) - 1].hwnd, C.SW_HIDE)
}
C.tabAppend(t._hwnd, toUTF16(name))
}
//export tabChanging
func tabChanging(data unsafe.Pointer, current C.LRESULT) {
t := (*tab)(data)
C.ShowWindow(t.tabs[int(current)].hwnd, C.SW_HIDE)
}
//export tabChanged
func tabChanged(data unsafe.Pointer, new C.LRESULT) {
t := (*tab)(data)
C.ShowWindow(t.tabs[int(new)].hwnd, C.SW_SHOW)
}
func (t *tab) hwnd() C.HWND {
return t._hwnd
}
func (t *tab) setParent(p *controlParent) {
basesetParent(t, p)
for _, l := range t.tabs {
l.setParent(p)
}
t.parent = p
}
func (t *tab) allocate(x int, y int, width int, height int, d *sizing) []*allocation {
return baseallocate(t, x, y, width, height, d)
}
func (t *tab) preferredSize(d *sizing) (width, height int) {
// TODO only consider the size of the current tab?
for _, s := range t.tabs {
w, h := s.child.preferredSize(d)
if width < w {
width = w
}
if height < h {
height = h
}
}
return width, height + int(C.tabGetTabHeight(t._hwnd))
}
// a tab control contains other controls; size appropriately
func (t *tab) commitResize(c *allocation, d *sizing) {
var r C.RECT
// figure out what the rect for each child is...
r.left = C.LONG(c.x) // load structure with the window's rect
r.top = C.LONG(c.y)
r.right = C.LONG(c.x + c.width)
r.bottom = C.LONG(c.y + c.height)
C.tabGetContentRect(t._hwnd, &r)
// and resize tabs
// don't resize just the current tab; resize all tabs!
for _, l := range t.tabs {
// because each widget is actually a child of the Window, the origin is the one we calculated above
// we use moveWindow() rather than calling resize() directly
// TODO
C.moveWindow(l.hwnd, C.int(r.left), C.int(r.top), C.int(r.right - r.left), C.int(r.bottom - r.top))
}
// and now resize the tab control itself
basecommitResize(t, c, d)
}
func (t *tab) getAuxResizeInfo(d *sizing) {
basegetAuxResizeInfo(t, d)
}
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