1 files changed, 106 insertions, 0 deletions
diff --git a/dialog_unix.go b/dialog_unix.go
new file mode 100644
index 0000000..9728e2a
--- /dev/null
+++ b/dialog_unix.go
@@ -0,0 +1,106 @@
+// +build !windows,!darwin,!plan9
+
+// 7 february 2014
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "gtk_unix.h"
+// /* because cgo seems to choke on ... */
+// /* parent will be NULL if there is no parent, so this is fine */
+// static inline GtkWidget *gtkNewMsgBox(GtkWindow *parent, GtkMessageType type, GtkButtonsType buttons, char *title, char *text)
+// {
+// 	GtkWidget *k;
+//
+// 	k = gtk_message_dialog_new(parent, GTK_DIALOG_MODAL, type, buttons, "%s", (gchar *) title);
+// 	if (text != NULL)
+// 		gtk_message_dialog_format_secondary_text((GtkMessageDialog *) k, "%s", (gchar *) text);
+// 	return k;
+// }
+import "C"
+
+// the actual type of these constants is GtkResponseType but gtk_dialog_run() returns a gint
+var dialogResponses = map[C.gint]Response{
+	C.GTK_RESPONSE_OK:		OK,
+}
+
+// dialog performs the bookkeeping involved for having a GtkDialog behave the way we want.
+type dialog struct {
+	parent    *Window
+	pwin      *C.GtkWindow
+	hadgroup  C.gboolean
+	prevgroup *C.GtkWindowGroup
+	newgroup  *C.GtkWindowGroup
+	result    Response
+}
+
+func mkdialog(parent *Window) *dialog {
+	return &dialog{
+		parent: parent,
+	}
+}
+
+func (d *dialog) prepare() {
+	// to implement parent, we need to put the GtkMessageDialog into a new window group along with parent
+	// a GtkWindow can only be part of one group
+	// so we use this to save the parent window group (if there is one) and store the new window group
+	// after showing the message box, we restore the previous window group, so future parent == dialogWindow can work properly
+	// thanks to pbor and mclasen in irc.gimp.net/#gtk+
+	if d.parent != dialogWindow {
+		d.pwin = togtkwindow(d.parent.sysData.widget)
+		d.hadgroup = C.gtk_window_has_group(d.pwin)
+		// we can't remove a window from the "default window group"; otherwise this throws up Gtk-CRITICAL warnings
+		if d.hadgroup != C.FALSE {
+			d.prevgroup = C.gtk_window_get_group(d.pwin)
+			C.gtk_window_group_remove_window(d.prevgroup, d.pwin)
+		}
+		d.newgroup = C.gtk_window_group_new()
+		C.gtk_window_group_add_window(d.newgroup, d.pwin)
+	}
+}
+
+func (d *dialog) cleanup(box *C.GtkWidget) {
+	// have to explicitly close the dialog box, otherwise wacky things will happen
+	C.gtk_widget_destroy(box)
+	if d.parent != dialogWindow {
+		C.gtk_window_group_remove_window(d.newgroup, d.pwin)
+		C.g_object_unref(C.gpointer(unsafe.Pointer(d.newgroup))) // free the group
+		if d.prevgroup != nil {
+			C.gtk_window_group_add_window(d.prevgroup, d.pwin)
+		} // otherwise it'll go back into the default group on its own
+	}
+}
+
+func (d *dialog) run(mk func() *C.GtkWidget) {
+	d.prepare()
+	box := mk()
+	r := C.gtk_dialog_run((*C.GtkDialog)(unsafe.Pointer(box)))
+	d.cleanup(box)
+	d.result = dialogResponses[r]
+}
+
+func _msgBox(parent *Window, primarytext string, secondarytext string, msgtype C.GtkMessageType, buttons C.GtkButtonsType) (response Response) {
+	d := mkdialog(parent)
+	cprimarytext := C.CString(primarytext)
+	defer C.free(unsafe.Pointer(cprimarytext))
+	csecondarytext := (*C.char)(nil)
+	if secondarytext != "" {
+		csecondarytext = C.CString(secondarytext)
+		defer C.free(unsafe.Pointer(csecondarytext))
+	}
+	d.run(func() *C.GtkWidget {
+		return C.gtkNewMsgBox(d.pwin, msgtype, buttons, cprimarytext, csecondarytext)
+	})
+	return d.result
+}
+
+func (w *Window) msgBox(primarytext string, secondarytext string) {
+	_msgBox(w, primarytext, secondarytext, C.GtkMessageType(C.GTK_MESSAGE_OTHER), C.GtkButtonsType(C.GTK_BUTTONS_OK))
+}
+
+func (w *Window) msgBoxError(primarytext string, secondarytext string) {
+	_msgBox(w, primarytext, secondarytext, C.GtkMessageType(C.GTK_MESSAGE_ERROR), C.GtkButtonsType(C.GTK_BUTTONS_OK))
+}