111 lines
3.0 KiB
Go
111 lines
3.0 KiB
Go
// 25 july 2014
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package ui
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import (
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"unsafe"
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)
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// #include "winapi_windows.h"
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import "C"
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/*
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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.
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TODO
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- make sure all tabs cannot be deselected (that is, make sure the current tab can never have index -1)
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- see if we can safely make the controls children of the tab control itself or if that would just screw our subclassing
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*/
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type tab struct {
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*controlbase
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tabs []*sizer
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supersetParent func(p *controlParent)
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superallocate func(x int, y int, width int, height int, d *sizing) []*allocation
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}
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func newTab() Tab {
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c := newControl(C.xWC_TABCONTROL,
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C.TCS_TOOLTIPS | C.WS_TABSTOP,
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0)
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t := &tab{
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controlbase: c,
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}
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t.supersetParent = t.fsetParent
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t.fsetParent = t.tabsetParent
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t.fpreferredSize = t.tabpreferredSize
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t.superallocate = t.fallocate
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t.fallocate = t.taballocate
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C.controlSetControlFont(t.hwnd)
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C.setTabSubclass(t.hwnd, unsafe.Pointer(t))
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return t
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}
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func (t *tab) tabsetParent(p *controlParent) {
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t.supersetParent(p)
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for _, c := range t.tabs {
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c.child.setParent(p)
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}
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}
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func (t *tab) Append(name string, control Control) {
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s := new(sizer)
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t.tabs = append(t.tabs, s)
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s.child = control
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if t.parent != nil {
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s.child.setParent(&controlParent{t.parent})
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}
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// initially hide tab 1..n controls; if we don't, they'll appear over other tabs, resulting in weird behavior
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if len(t.tabs) != 1 {
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s.child.containerHide()
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}
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C.tabAppend(t.hwnd, toUTF16(name))
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}
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//export tabChanging
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func tabChanging(data unsafe.Pointer, current C.LRESULT) {
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t := (*tab)(data)
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t.tabs[int(current)].child.containerHide()
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}
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//export tabChanged
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func tabChanged(data unsafe.Pointer, new C.LRESULT) {
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t := (*tab)(data)
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t.tabs[int(new)].child.containerShow()
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}
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func (t *tab) tabpreferredSize(d *sizing) (width, height int) {
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// TODO only consider the size of the current tab?
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for _, s := range t.tabs {
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w, h := s.child.preferredSize(d)
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if width < w {
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width = w
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}
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if height < h {
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height = h
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}
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}
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return width, height + int(C.tabGetTabHeight(t.hwnd))
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}
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// a tab control contains other controls; size appropriately
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// TODO change this to commitResize()
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func (t *tab) taballocate(x int, y int, width int, height int, d *sizing) []*allocation {
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var r C.RECT
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// figure out what the rect for each child is...
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r.left = C.LONG(x) // load structure with the window's rect
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r.top = C.LONG(y)
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r.right = C.LONG(x + width)
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r.bottom = C.LONG(y + height)
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C.tabGetContentRect(t.hwnd, &r)
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// and allocate
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// don't allocate to just the current tab; allocate to all tabs!
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for _, s := range t.tabs {
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// because each widget is actually a child of the Window, the origin is the one we calculated above
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s.resize(int(r.left), int(r.top), int(r.right - r.left), int(r.bottom - r.top))
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}
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// and now allocate the tab control itself
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return t.superallocate(x, y, width, height, d)
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}
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