92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
// 15 august 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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type group struct {
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*controlSingleHWNDWithText
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child Control
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margined bool
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}
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func newGroup(text string, control Control) Group {
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hwnd := C.newControl(buttonclass,
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C.BS_GROUPBOX,
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C.WS_EX_CONTROLPARENT)
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g := &group{
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controlSingleHWNDWithText: newControlSingleHWNDWithText(hwnd),
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child: control,
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}
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g.fpreferredSize = g.xpreferredSize
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g.fnTabStops = control.nTabStops // groupbox itself is not tabbable but the contents might be
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g.SetText(text)
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C.controlSetControlFont(g.hwnd)
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C.setGroupSubclass(g.hwnd, unsafe.Pointer(g))
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control.setParent(&controlParent{g.hwnd})
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return g
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}
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func (g *group) Text() string {
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return g.text()
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}
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func (g *group) SetText(text string) {
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g.setText(text)
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}
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func (g *group) Margined() bool {
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return g.margined
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}
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func (g *group) SetMargined(margined bool) {
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g.margined = margined
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}
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const (
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groupXMargin = 6
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groupYMarginTop = 11 // note this value /includes the groupbox label/
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groupYMarginBottom = 7
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)
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func (g *group) xpreferredSize(d *sizing) (width, height int) {
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var r C.RECT
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width, height = g.child.preferredSize(d)
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if width < int(g.textlen) { // if the text is longer, try not to truncate
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width = int(g.textlen)
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}
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r.left = 0
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r.top = 0
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r.right = C.LONG(width)
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r.bottom = C.LONG(height)
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// use negative numbers to increase the size of the rectangle
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if g.margined {
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marginRectDLU(&r, -groupYMarginTop, -groupYMarginBottom, -groupXMargin, -groupXMargin, d)
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} else {
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// unforutnately, as mentioned above, the size of a groupbox includes the label and border
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// 1 character cell (4DLU x, 8DLU y) on each side (but only 3DLU on the bottom) should be enough to make up for that; TODO is not, we can change it
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// TODO make these named constants
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marginRectDLU(&r, -8, -3, -4, -4, d)
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}
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return int(r.right - r.left), int(r.bottom - r.top)
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}
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//export groupResized
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func groupResized(data unsafe.Pointer, r C.RECT) {
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g := (*group)(unsafe.Pointer(data))
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d := beginResize(g.hwnd)
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if g.margined {
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// see above
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marginRectDLU(&r, groupYMarginTop, groupYMarginBottom, groupXMargin, groupXMargin, d)
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} else {
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marginRectDLU(&r, 8, 3, 4, 4, d)
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}
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g.child.resize(int(r.left), int(r.top), int(r.right - r.left), int(r.bottom - r.top), d)
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}
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