116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
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// 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 that notify their parent when the user wants to do things; changing the contents of a switching container (such as a tab control) must be done manually.
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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.
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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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*/
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type tab struct {
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_hwnd C.HWND
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tabs []*container
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switchrect C.RECT // size that new tab should take when switching to it
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}
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func newTab() Tab {
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hwnd := 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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_hwnd: hwnd,
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}
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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) Append(name string, control Control) {
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c := newContainer(control)
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c.setParent(&controlParent{t._hwnd})
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t.tabs = append(t.tabs, c)
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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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t.tabs[len(t.tabs) - 1].hide()
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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)].hide()
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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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// resize the new tab...
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t.tabs[int(new)].move(&t.switchrect)
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// ...then show
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t.tabs[int(new)].show()
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}
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func (t *tab) hwnd() C.HWND {
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return t._hwnd
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}
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func (t *tab) setParent(p *controlParent) {
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basesetParent(t, p)
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}
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func (t *tab) allocate(x int, y int, width int, height int, d *sizing) []*allocation {
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return baseallocate(t, x, y, width, height, d)
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}
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func (t *tab) preferredSize(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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func (t *tab) commitResize(c *allocation, d *sizing) {
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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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// the tab contents are children of the tab itself, so ignore c.x and c.y, which are relative to the window!
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r.left = C.LONG(0)
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r.top = C.LONG(0)
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r.right = C.LONG(c.width)
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r.bottom = C.LONG(c.height)
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C.tabGetContentRect(t._hwnd, &r)
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// and resize tabs
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// resize only the current tab; we trigger a resize on a tab change to make sure things look correct
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if len(t.tabs) > 0 {
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t.tabs[C.SendMessageW(t._hwnd, C.TCM_GETCURSEL, 0, 0)].move(&r)
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}
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// save the tab size so we can
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t.switchrect = r
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// and now resize the tab control itself
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basecommitResize(t, c, d)
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}
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func (t *tab) getAuxResizeInfo(d *sizing) {
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basegetAuxResizeInfo(t, d)
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}
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