qulogic/libgnt

Make the combobox a bit more friendly.

2010-07-05, Sadrul Habib Chowdhury
47a58a8fcb6e
Make the combobox a bit more friendly.

While the dropdown in the combobox is not shown, and some key is pressed
that triggers an action in the dropdown (e.g. home, end keys etc.), popup
the dropdown.
/**
* GNT - The GLib Ncurses Toolkit
*
* GNT is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include "gntinternal.h"
#include "gntbox.h"
#include "gntcombobox.h"
#include "gnttree.h"
#include "gntmarshal.h"
#include "gntstyle.h"
#include "gntutils.h"
#include <string.h>
enum
{
SIG_SELECTION_CHANGED,
SIGS,
};
static GntWidgetClass *parent_class = NULL;
static guint signals[SIGS] = { 0 };
static void (*widget_lost_focus)(GntWidget *widget);
static void
set_selection(GntComboBox *box, gpointer key)
{
if (box->selected != key)
{
/* XXX: make sure the key actually does exist */
gpointer old = box->selected;
box->selected = key;
if (GNT_WIDGET(box)->window)
gnt_widget_draw(GNT_WIDGET(box));
if (box->dropdown)
gnt_tree_set_selected(GNT_TREE(box->dropdown), key);
g_signal_emit(box, signals[SIG_SELECTION_CHANGED], 0, old, key);
}
}
static void
hide_popup(GntComboBox *box, gboolean set)
{
gnt_widget_set_size(box->dropdown,
box->dropdown->priv.width - 1, box->dropdown->priv.height);
if (set)
set_selection(box, gnt_tree_get_selection_data(GNT_TREE(box->dropdown)));
else
gnt_tree_set_selected(GNT_TREE(box->dropdown), box->selected);
gnt_widget_hide(box->dropdown->parent);
}
static void
gnt_combo_box_draw(GntWidget *widget)
{
GntComboBox *box = GNT_COMBO_BOX(widget);
char *text = NULL, *s;
GntColorType type;
int len;
if (box->dropdown && box->selected)
text = gnt_tree_get_selection_text(GNT_TREE(box->dropdown));
if (text == NULL)
text = g_strdup("");
if (gnt_widget_has_focus(widget))
type = GNT_COLOR_HIGHLIGHT;
else
type = GNT_COLOR_NORMAL;
wbkgdset(widget->window, '\0' | gnt_color_pair(type));
s = (char*)gnt_util_onscreen_width_to_pointer(text, widget->priv.width - 4, &len);
*s = '\0';
mvwaddstr(widget->window, 1, 1, C_(text));
whline(widget->window, ' ' | gnt_color_pair(type), widget->priv.width - 4 - len);
mvwaddch(widget->window, 1, widget->priv.width - 3, ACS_VLINE | gnt_color_pair(GNT_COLOR_NORMAL));
mvwaddch(widget->window, 1, widget->priv.width - 2, ACS_DARROW | gnt_color_pair(GNT_COLOR_NORMAL));
wmove(widget->window, 1, 1);
g_free(text);
GNTDEBUG;
}
static void
gnt_combo_box_size_request(GntWidget *widget)
{
if (!GNT_WIDGET_IS_FLAG_SET(widget, GNT_WIDGET_MAPPED))
{
GntWidget *dd = GNT_COMBO_BOX(widget)->dropdown;
gnt_widget_size_request(dd);
widget->priv.height = 3; /* For now, a combobox will have border */
widget->priv.width = MAX(10, dd->priv.width + 2);
}
}
static void
gnt_combo_box_map(GntWidget *widget)
{
if (widget->priv.width == 0 || widget->priv.height == 0)
gnt_widget_size_request(widget);
GNTDEBUG;
}
static void
popup_dropdown(GntComboBox *box)
{
GntWidget *widget = GNT_WIDGET(box);
GntWidget *parent = box->dropdown->parent;
int height = g_list_length(GNT_TREE(box->dropdown)->list);
int y = widget->priv.y + widget->priv.height - 1;
gnt_widget_set_size(box->dropdown, widget->priv.width, height + 2);
if (y + height + 2 >= getmaxy(stdscr))
y = widget->priv.y - height - 1;
gnt_widget_set_position(parent, widget->priv.x, y);
if (parent->window)
{
mvwin(parent->window, y, widget->priv.x);
wresize(parent->window, height+2, widget->priv.width);
}
parent->priv.width = widget->priv.width;
parent->priv.height = height + 2;
GNT_WIDGET_UNSET_FLAGS(parent, GNT_WIDGET_INVISIBLE);
gnt_widget_draw(parent);
}
static gboolean
gnt_combo_box_key_pressed(GntWidget *widget, const char *text)
{
GntComboBox *box = GNT_COMBO_BOX(widget);
if (GNT_WIDGET_IS_FLAG_SET(box->dropdown->parent, GNT_WIDGET_MAPPED)) {
if (text[1] == 0) {
switch (text[0]) {
case '\r':
case '\t':
case '\n':
hide_popup(box, TRUE);
return TRUE;
case 27:
hide_popup(box, FALSE);
return TRUE;
}
}
}
if (gnt_widget_key_pressed(box->dropdown, text)) {
if (!GNT_WIDGET_IS_FLAG_SET(box->dropdown->parent, GNT_WIDGET_MAPPED))
popup_dropdown(box);
return TRUE;
}
return FALSE;
}
static void
gnt_combo_box_destroy(GntWidget *widget)
{
gnt_widget_destroy(GNT_COMBO_BOX(widget)->dropdown->parent);
}
static void
gnt_combo_box_lost_focus(GntWidget *widget)
{
GntComboBox *combo = GNT_COMBO_BOX(widget);
if (GNT_WIDGET_IS_FLAG_SET(combo->dropdown->parent, GNT_WIDGET_MAPPED))
hide_popup(combo, FALSE);
widget_lost_focus(widget);
}
static gboolean
gnt_combo_box_clicked(GntWidget *widget, GntMouseEvent event, int x, int y)
{
GntComboBox *box = GNT_COMBO_BOX(widget);
gboolean dshowing = GNT_WIDGET_IS_FLAG_SET(box->dropdown->parent, GNT_WIDGET_MAPPED);
if (event == GNT_MOUSE_SCROLL_UP) {
if (dshowing)
gnt_widget_key_pressed(box->dropdown, GNT_KEY_UP);
} else if (event == GNT_MOUSE_SCROLL_DOWN) {
if (dshowing)
gnt_widget_key_pressed(box->dropdown, GNT_KEY_DOWN);
} else if (event == GNT_LEFT_MOUSE_DOWN) {
if (dshowing) {
hide_popup(box, TRUE);
} else {
popup_dropdown(GNT_COMBO_BOX(widget));
}
} else
return FALSE;
return TRUE;
}
static void
gnt_combo_box_size_changed(GntWidget *widget, int oldw, int oldh)
{
GntComboBox *box = GNT_COMBO_BOX(widget);
gnt_widget_set_size(box->dropdown, widget->priv.width - 1, box->dropdown->priv.height);
}
static gboolean
dropdown_menu(GntBindable *b, GList *null)
{
if (GNT_WIDGET_IS_FLAG_SET(GNT_COMBO_BOX(b)->dropdown->parent, GNT_WIDGET_MAPPED))
return FALSE;
popup_dropdown(GNT_COMBO_BOX(b));
return TRUE;
}
static void
gnt_combo_box_class_init(GntComboBoxClass *klass)
{
GntBindableClass *bindable = GNT_BINDABLE_CLASS(klass);
parent_class = GNT_WIDGET_CLASS(klass);
parent_class->destroy = gnt_combo_box_destroy;
parent_class->draw = gnt_combo_box_draw;
parent_class->map = gnt_combo_box_map;
parent_class->size_request = gnt_combo_box_size_request;
parent_class->key_pressed = gnt_combo_box_key_pressed;
parent_class->clicked = gnt_combo_box_clicked;
parent_class->size_changed = gnt_combo_box_size_changed;
widget_lost_focus = parent_class->lost_focus;
parent_class->lost_focus = gnt_combo_box_lost_focus;
signals[SIG_SELECTION_CHANGED] =
g_signal_new("selection-changed",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
gnt_closure_marshal_VOID__POINTER_POINTER,
G_TYPE_NONE, 2, G_TYPE_POINTER, G_TYPE_POINTER);
gnt_bindable_class_register_action(bindable, "dropdown", dropdown_menu,
GNT_KEY_DOWN, NULL);
gnt_bindable_register_binding(bindable, "dropdown", GNT_KEY_UP, NULL);
gnt_style_read_actions(G_OBJECT_CLASS_TYPE(klass), bindable);
GNTDEBUG;
}
static void
gnt_combo_box_init(GTypeInstance *instance, gpointer class)
{
GntWidget *box;
GntWidget *widget = GNT_WIDGET(instance);
GntComboBox *combo = GNT_COMBO_BOX(instance);
GNT_WIDGET_SET_FLAGS(GNT_WIDGET(instance),
GNT_WIDGET_GROW_X | GNT_WIDGET_CAN_TAKE_FOCUS | GNT_WIDGET_NO_SHADOW);
combo->dropdown = gnt_tree_new();
box = gnt_box_new(FALSE, FALSE);
GNT_WIDGET_SET_FLAGS(box, GNT_WIDGET_NO_SHADOW | GNT_WIDGET_NO_BORDER | GNT_WIDGET_TRANSIENT);
gnt_box_set_pad(GNT_BOX(box), 0);
gnt_box_add_widget(GNT_BOX(box), combo->dropdown);
widget->priv.minw = 4;
widget->priv.minh = 3;
GNTDEBUG;
}
/******************************************************************************
* GntComboBox API
*****************************************************************************/
GType
gnt_combo_box_get_gtype(void)
{
static GType type = 0;
if(type == 0)
{
static const GTypeInfo info = {
sizeof(GntComboBoxClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc)gnt_combo_box_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof(GntComboBox),
0, /* n_preallocs */
gnt_combo_box_init, /* instance_init */
NULL /* value_table */
};
type = g_type_register_static(GNT_TYPE_WIDGET,
"GntComboBox",
&info, 0);
}
return type;
}
GntWidget *gnt_combo_box_new()
{
GntWidget *widget = g_object_new(GNT_TYPE_COMBO_BOX, NULL);
return widget;
}
void gnt_combo_box_add_data(GntComboBox *box, gpointer key, const char *text)
{
gnt_tree_add_row_last(GNT_TREE(box->dropdown), key,
gnt_tree_create_row(GNT_TREE(box->dropdown), text), NULL);
if (box->selected == NULL)
set_selection(box, key);
}
gpointer gnt_combo_box_get_selected_data(GntComboBox *box)
{
return box->selected;
}
void gnt_combo_box_set_selected(GntComboBox *box, gpointer key)
{
set_selection(box, key);
}
void gnt_combo_box_remove(GntComboBox *box, gpointer key)
{
gnt_tree_remove(GNT_TREE(box->dropdown), key);
if (box->selected == key)
set_selection(box, NULL);
}
void gnt_combo_box_remove_all(GntComboBox *box)
{
gnt_tree_remove_all(GNT_TREE(box->dropdown));
set_selection(box, NULL);
}