85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
// +build !windows,!darwin
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// 23 february 2014
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package ui
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import (
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"unsafe"
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"fmt"
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)
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// #include "gtk_unix.h"
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// extern void layoutResizing(GtkWidget *, GdkRectangle *, gpointer);
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import "C"
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type sizing struct {
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sizingbase
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// for size calculations
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// gtk+ needs nothing
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// for the actual resizing
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shouldVAlignTop bool
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}
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const (
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gtkXMargin = 12
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gtkYMargin = 12
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gtkXPadding = 12
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gtkYPadding = 6
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)
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func (s *sizer) beginResize() (d *sizing) {
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d = new(sizing)
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if spaced {
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d.xmargin = gtkXMargin
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d.ymargin = gtkYMargin
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d.xpadding = gtkXPadding
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d.ypadding = gtkYPadding
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}
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return d
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}
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func (s *sizer) translateAllocationCoords(allocations []*allocation, winwidth, winheight int) {
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// no need for coordinate conversion with gtk+
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}
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// layout maintains the widget hierarchy by containing all of a sizer's children in a single layout widget
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type layout struct {
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*sizer
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layoutwidget *C.GtkWidget
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layoutcontainer *C.GtkContainer
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layout *C.GtkLayout
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}
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func newLayout(child Control) *layout {
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widget := C.gtk_layout_new(nil, nil)
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l := &layout{
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sizer: new(sizer),
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layoutwidget: widget,
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layoutcontainer: (*C.GtkContainer)(unsafe.Pointer(widget)),
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layout: (*C.GtkLayout)(unsafe.Pointer(widget)),
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}
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l.child = child
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l.child.setParent(&controlParent{l.layoutcontainer})
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// we connect to the layout's size-allocate, not to the window's configure-event
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// this allows us to handle client-side decoration-based configurations (such as GTK+ on Wayland) properly
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// also see commitResize() in sizing_unix.go for additional notes
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// thanks to many people in irc.gimp.net/#gtk+ for help (including tristan for suggesting g_signal_connect_after())
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g_signal_connect_after(
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C.gpointer(unsafe.Pointer(l.layout)),
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"size-allocate",
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C.GCallback(C.layoutResizing),
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C.gpointer(unsafe.Pointer(l)))
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return l
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}
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//export layoutResizing
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func layoutResizing(wid *C.GtkWidget, r *C.GdkRectangle, data C.gpointer) {
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l := (*layout)(unsafe.Pointer(data))
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// the layout's coordinate system is localized, so the origin is (0, 0)
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l.resize(0, 0, int(r.width), int(r.height))
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fmt.Printf("new size %d x %d\n", r.width, r.height)
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}
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