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// +build !windows,!darwin,!plan9
// 17 february 2014
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package ui
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import (
"unsafe"
)
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/ *
GTK + 3.10 introduces a dedicated GtkListView type for simple listboxes like our Listbox . Unfortunately , since I want to target at least GTK + 3.4 , I need to do things the old , long , and hard way : manually with a GtkTreeView and GtkListStore model .
You are not expected to understand this .
if you must though :
GtkTreeViews are model / view . We use a GtkListStore as a model .
GtkTreeViews also separate selections into another type , but the GtkTreeView creates the selection object for us .
GtkTreeViews can scroll , but do not draw scrollbars or borders ; we need to use a GtkScrolledWindow to hold the GtkTreeView to do so . We return the GtkScrolledWindow and get its control out when we want to access the GtkTreeView .
Like with Windows , there ' s a difference between signle - selection and multi - selection GtkTreeViews when it comes to getting the list of selections that we can exploit . The GtkTreeSelection class hands us an iterator and the model ( for some reason ) . We pull a GtkTreePath out of the iterator , which we can then use to get the indices or text data .
For more information , read
https : //developer.gnome.org/gtk3/3.4/TreeWidget.html
http : //ubuntuforums.org/showthread.php?t=1208655
http : //scentric.net/tutorial/sec-treemodel-remove-row.html
http : //gtk.10911.n7.nabble.com/Scrollbars-in-a-GtkTreeView-td58076.html
http : //stackoverflow.com/questions/11407447/gtk-treeview-get-current-row-index-in-python (I think; I don't remember if I wound up using this one as a reference or not; I know after that I found the ubuntuforums link above)
and the GTK + reference documentation .
* /
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// #cgo pkg-config: gtk+-3.0
// #include <stdlib.h>
// #include <gtk/gtk.h>
// /* because cgo seems to choke on ... */
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// void gtkTreeModelGet(GtkTreeModel *model, GtkTreeIter *iter, gchar **gs)
// {
// /* 0 is the column #; we only have one column here */
// gtk_tree_model_get(model, iter, 0, gs, -1);
// }
// GtkListStore *gtkListStoreNew(void)
// {
// /* 1 column that stores strings */
// return gtk_list_store_new(1, G_TYPE_STRING);
// }
// void gtkListStoreSet(GtkListStore *ls, GtkTreeIter *iter, char *gs)
// {
// /* same parameters as in gtkTreeModelGet() */
// gtk_list_store_set(ls, iter, 0, (gchar *) gs, -1);
// }
// GtkTreeViewColumn *gtkTreeViewColumnNewWithAttributes(GtkCellRenderer *renderer)
// {
// /* "" is the column header; "text" associates the text of the column with column 0 */
// return gtk_tree_view_column_new_with_attributes("", renderer, "text", 0, NULL);
// }
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import "C"
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func fromgtktreemodel ( x * C . GtkTreeModel ) * gtkWidget {
return ( * gtkWidget ) ( unsafe . Pointer ( x ) )
}
func togtktreemodel ( what * gtkWidget ) * C . GtkTreeModel {
return ( * C . GtkTreeModel ) ( unsafe . Pointer ( what ) )
}
func fromgtktreeview ( x * C . GtkTreeView ) * gtkWidget {
return ( * gtkWidget ) ( unsafe . Pointer ( x ) )
}
func togtktreeview ( what * gtkWidget ) * C . GtkTreeView {
return ( * C . GtkTreeView ) ( unsafe . Pointer ( what ) )
}
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func gListboxNew ( multisel bool ) * gtkWidget {
store := C . gtkListStoreNew ( )
widget := C . gtk_tree_view_new_with_model ( ( * C . GtkTreeModel ) ( unsafe . Pointer ( store ) ) )
tv := ( * C . GtkTreeView ) ( unsafe . Pointer ( widget ) )
column := C . gtkTreeViewColumnNewWithAttributes ( C . gtk_cell_renderer_text_new ( ) )
// TODO set AUTOSIZE?
C . gtk_tree_view_append_column ( tv , column )
C . gtk_tree_view_set_headers_visible ( tv , C . FALSE )
sel := C . GTK_SELECTION_SINGLE
if multisel {
sel = C . GTK_SELECTION_MULTIPLE
}
C . gtk_tree_selection_set_mode ( C . gtk_tree_view_get_selection ( tv ) , C . GtkSelectionMode ( sel ) )
scrollarea := C . gtk_scrolled_window_new ( ( * C . GtkAdjustment ) ( nil ) , ( * C . GtkAdjustment ) ( nil ) )
C . gtk_container_add ( ( * C . GtkContainer ) ( unsafe . Pointer ( scrollarea ) ) , widget )
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return fromgtkwidget ( scrollarea )
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}
func gListboxNewSingle ( ) * gtkWidget {
return gListboxNew ( false )
}
func gListboxNewMulti ( ) * gtkWidget {
return gListboxNew ( true )
}
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func getTreeViewFrom ( widget * gtkWidget ) * C . GtkTreeView {
wid := C . gtk_bin_get_child ( ( * C . GtkBin ) ( unsafe . Pointer ( widget ) ) )
return ( * C . GtkTreeView ) ( unsafe . Pointer ( wid ) )
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}
func gListboxText ( widget * gtkWidget ) string {
var model * C . GtkTreeModel
var iter C . GtkTreeIter
var gs * C . gchar
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tv := getTreeViewFrom ( widget )
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sel := C . gtk_tree_view_get_selection ( tv )
if ! fromgbool ( C . gtk_tree_selection_get_selected ( sel , & model , & iter ) ) {
return ""
}
C . gtkTreeModelGet ( model , & iter , & gs )
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return C . GoString ( fromgchar ( gs ) )
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}
func gListboxAppend ( widget * gtkWidget , what string ) {
var iter C . GtkTreeIter
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tv := getTreeViewFrom ( widget )
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ls := ( * C . GtkListStore ) ( unsafe . Pointer ( C . gtk_tree_view_get_model ( tv ) ) )
C . gtk_list_store_append ( ls , & iter )
cwhat := C . CString ( what )
defer C . free ( unsafe . Pointer ( cwhat ) )
C . gtkListStoreSet ( ls , & iter , cwhat )
}
func gListboxInsert ( widget * gtkWidget , index int , what string ) {
var iter C . GtkTreeIter
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tv := getTreeViewFrom ( widget )
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ls := ( * C . GtkListStore ) ( unsafe . Pointer ( C . gtk_tree_view_get_model ( tv ) ) )
C . gtk_list_store_insert ( ls , & iter , C . gint ( index ) )
cwhat := C . CString ( what )
defer C . free ( unsafe . Pointer ( cwhat ) )
C . gtkListStoreSet ( ls , & iter , cwhat )
}
func gListboxSelectedMulti ( widget * gtkWidget ) ( indices [ ] int ) {
var model * C . GtkTreeModel
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tv := getTreeViewFrom ( widget )
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sel := C . gtk_tree_view_get_selection ( tv )
rows := C . gtk_tree_selection_get_selected_rows ( sel , & model )
defer C . g_list_free_full ( rows , C . GDestroyNotify ( unsafe . Pointer ( C . gtk_tree_path_free ) ) )
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// TODO needed?
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len := C . g_list_length ( rows )
if len == 0 {
return nil
}
indices = make ( [ ] int , len )
for i := C . guint ( 0 ) ; i < len ; i ++ {
path := ( * C . GtkTreePath ) ( unsafe . Pointer ( rows . data ) )
idx := C . gtk_tree_path_get_indices ( path )
indices [ i ] = int ( * idx )
rows = rows . next
}
return indices
}
func gListboxSelMultiTexts ( widget * gtkWidget ) ( texts [ ] string ) {
var model * C . GtkTreeModel
var iter C . GtkTreeIter
var gs * C . gchar
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tv := getTreeViewFrom ( widget )
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sel := C . gtk_tree_view_get_selection ( tv )
rows := C . gtk_tree_selection_get_selected_rows ( sel , & model )
defer C . g_list_free_full ( rows , C . GDestroyNotify ( unsafe . Pointer ( C . gtk_tree_path_free ) ) )
len := C . g_list_length ( rows )
if len == 0 {
return nil
}
texts = make ( [ ] string , len )
for i := C . guint ( 0 ) ; i < len ; i ++ {
path := ( * C . GtkTreePath ) ( unsafe . Pointer ( rows . data ) )
if ! fromgbool ( C . gtk_tree_model_get_iter ( model , & iter , path ) ) {
// TODO
return
}
C . gtkTreeModelGet ( model , & iter , & gs )
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texts [ i ] = C . GoString ( fromgchar ( gs ) )
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rows = rows . next
}
return texts
}
func gListboxDelete ( widget * gtkWidget , index int ) {
var iter C . GtkTreeIter
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tv := getTreeViewFrom ( widget )
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ls := ( * C . GtkListStore ) ( unsafe . Pointer ( C . gtk_tree_view_get_model ( tv ) ) )
if ! fromgbool ( C . gtk_tree_model_iter_nth_child ( ( * C . GtkTreeModel ) ( unsafe . Pointer ( ls ) ) , & iter , ( * C . GtkTreeIter ) ( nil ) , C . gint ( index ) ) ) { // no such index
// TODO
return
}
C . gtk_list_store_remove ( ls , & iter )
}
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// this is a separate function because Combobox uses it too
func gtkTreeModelListLen ( model * C . GtkTreeModel ) int {
// "As a special case, if iter is NULL, then the number of toplevel nodes is returned."
return int ( C . gtk_tree_model_iter_n_children ( model , ( * C . GtkTreeIter ) ( nil ) ) )
}
func gListboxLen ( widget * gtkWidget ) int {
tv := getTreeViewFrom ( widget )
model := C . gtk_tree_view_get_model ( tv )
return gtkTreeModelListLen ( model )
}