99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
// 15 august 2014
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package ui
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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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chainresize func(x int, y int, width int, height int, d *sizing)
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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.chainresize = g.fresize
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g.fresize = g.xresize
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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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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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// 1DLU on each side 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, -1, -1, -1, -1, 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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func (g *group) xresize(x int, y int, width int, height int, d *sizing) {
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// first, chain up to the container base to keep the Z-order correct
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g.chainresize(x, y, width, height, d)
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// now resize the child container
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var r C.RECT
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// pretend that the client area of the group box only includes the actual empty space
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// container will handle the necessary adjustments properly
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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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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, 1, 1, 1, 1, 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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