Began the GTK+ backend migration. control_unix.go is migrated; Area overlay changes are done now so I don't forget later as well.

1 files changed, 121 insertions, 0 deletions

diff --git a/newctrl/control_unix.go b/newctrl/control_unix.go
new file mode 100644
index 0000000..cec2061
--- /dev/null
+++ b/newctrl/control_unix.go
@@ -0,0 +1,121 @@
+// +build !windows,!darwin
+
+// 30 july 2014
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "gtk_unix.h"
+import "C"
+
+type controlParent struct {
+	c *C.GtkContainer
+}
+
+type controlSingleWidget struct {
+	*controlbase
+	widget	*C.GtkWidget
+}
+
+func newControlSingleWidget(widget *C.GtkWidget) *controlSingleWidget {
+	c := new(controlSingleWidget)
+	c.controlbase = &controlbase{
+		fsetParent:		c.setParent,
+		fpreferredSize:		c.preferredSize,
+		fresize:			c.resize,
+	}
+	c.widget = widget
+	return c
+}
+
+func (c *controlSingleWidget) setParent(p *controlParent) {
+	C.gtk_container_add(p.c, c.widget)
+	// make sure the new widget is shown if not explicitly hidden
+	// TODO why did I have this again?
+	C.gtk_widget_show_all(c.widget)
+}
+
+func (c *controlSingleWidget) preferredSize(d *sizing) (int, int) {
+	// GTK+ 3 makes this easy: controls can tell us what their preferred size is!
+	// ...actually, it tells us two things: the "minimum size" and the "natural size".
+	// The "minimum size" is the smallest size we /can/ display /anything/. The "natural size" is the smallest size we would /prefer/ to display.
+	// The difference? Minimum size takes into account things like truncation with ellipses: the minimum size of a label can allot just the ellipses!
+	// So we use the natural size instead.
+	// There is a warning about height-for-width controls, but in my tests this isn't an issue.
+	var r C.GtkRequisition
+
+	C.gtk_widget_get_preferred_size(c.widget, nil, &r)
+	return int(r.width), int(r.height)
+}
+
+func (c *controlSingleWidget) resize(x int, y int, width int, height int, d *sizing) {
+	// as we resize on size-allocate, we have to also use size-allocate on our children
+	// this is fine anyway; in fact, this allows us to move without knowing what the container is!
+	// this is what GtkBox does anyway
+	// thanks to tristan in irc.gimp.net/#gtk+
+
+	var r C.GtkAllocation
+
+	r.x = C.int(x)
+	r.y = C.int(y)
+	r.width = C.int(width)
+	r.height = C.int(height)
+	C.gtk_widget_size_allocate(c.widget, &r)
+}
+
+type scroller struct {
+	*controlSingleWidget
+
+	scroller	*controlSingleWidget
+	scrollwidget    *C.GtkWidget
+	scrollcontainer *C.GtkContainer
+	scrollwindow    *C.GtkScrolledWindow
+
+	overlay	*controlSingleWidget
+	overlaywidget    *C.GtkWidget
+	overlaycontainer *C.GtkContainer
+	overlayoverlay      *C.GtkOverlay
+}
+
+func newScroller(widget *C.GtkWidget, native bool, bordered bool, overlay bool) *scroller {
+	s := new(scroller)
+	s.controlSingleWidget = newControlSingleWidget(widget)
+	s.scrollwidget = C.gtk_scrolled_window_new(nil, nil)
+	s.scrollcontainer = (*C.GtkContainer)(unsafe.Pointer(s.scrollwidget))
+	s.scrollwindow = (*C.GtkScrolledWindow)(unsafe.Pointer(s.scrollwidget))
+
+	// any actual changing operations need to be done to the GtkScrolledWindow
+	// that is, everything /except/ preferredSize() are done to the GtkScrolledWindow
+	s.scroller = newControlSingleWidget(s.scrollwidget)
+	s.fsetParent = s.scroller.fsetParent
+	s.fresize = s.scroller.fresize
+
+	// in GTK+ 3.4 we still technically need to use the separate gtk_scrolled_window_add_with_viewpoint()/gtk_container_add() spiel for adding the widget to the scrolled window
+	if native {
+		C.gtk_container_add(s.scrollcontainer, s.widget)
+	} else {
+		C.gtk_scrolled_window_add_with_viewport(s.scrollwindow, s.widget)
+	}
+
+	// give the scrolled window a border (thanks to jlindgren in irc.gimp.net/#gtk+)
+	if bordered {
+		C.gtk_scrolled_window_set_shadow_type(s.scrollwindow, C.GTK_SHADOW_IN)
+	}
+
+	if overlay {
+		// ok things get REALLY fun now
+		// we now have to do all of the above again
+		s.overlaywidget = C.gtk_overlay_new()
+		s.overlaycontainer = (*C.GtkContainer)(unsafe.Pointer(s.overlaywidget))
+		s.overlayoverlay = (*C.GtkOverlay)(unsafe.Pointer(s.overlayoverlay))
+		s.overlay = newControlSingleWidget(s.overlaywidget)
+		s.fsetParent = s.overlay.fsetParent
+		s.fresize = s.overlay.fresize
+		C.gtk_container_add(s.overlaycontainer, s.scrollcontainer)
+	}
+
+	return s
+}