qulogic/libgnt

Fix arrow keys
fix-arrow-keys
2019-02-20, Petteri Pitkänen
7ac801527b0b
Fix arrow keys

The key-tree expects that for arrow keys the terminal transmits codes that
are defined in the terminfo database, but these codes are transmitted only
in application mode. To make the arrow key handling portable across
terminals, and to prevent the need for manually translating these codes, put
the terminal into application mode by calling ncurses keypad().

Fixes #12676.
/*
* 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 02110-1301, USA.
*/
#include "gntinternal.h"
#include "gntcolors.h"
#include "gntkeys.h"
#include "gntslider.h"
#include "gntstyle.h"
enum
{
SIG_VALUE_CHANGED,
SIGS,
};
static guint signals[SIGS] = { 0 };
static GntWidgetClass *parent_class = NULL;
/* returns TRUE if the value was changed */
static gboolean
sanitize_value(GntSlider *slider)
{
if (slider->current < slider->min)
slider->current = slider->min;
else if (slider->current > slider->max)
slider->current = slider->max;
else
return FALSE;
return TRUE;
}
static void
redraw_slider(GntSlider *slider)
{
GntWidget *widget = GNT_WIDGET(slider);
if (GNT_WIDGET_IS_FLAG_SET(widget, GNT_WIDGET_MAPPED))
gnt_widget_draw(widget);
}
static void
slider_value_changed(GntSlider *slider)
{
g_signal_emit(slider, signals[SIG_VALUE_CHANGED], 0, slider->current);
}
static void
gnt_slider_draw(GntWidget *widget)
{
GntSlider *slider = GNT_SLIDER(widget);
int attr = 0;
int position, size = 0;
if (slider->vertical)
size = widget->priv.height;
else
size = widget->priv.width;
if (gnt_widget_has_focus(widget))
attr |= GNT_COLOR_HIGHLIGHT;
else
attr |= GNT_COLOR_HIGHLIGHT_D;
if (slider->max != slider->min)
position = ((size - 1) * (slider->current - slider->min)) / (slider->max - slider->min);
else
position = 0;
if (slider->vertical) {
mvwvline(widget->window, size-position, 0, ACS_VLINE | gnt_color_pair(GNT_COLOR_NORMAL) | A_BOLD,
position);
mvwvline(widget->window, 0, 0, ACS_VLINE | gnt_color_pair(GNT_COLOR_NORMAL),
size-position);
} else {
mvwhline(widget->window, 0, 0, ACS_HLINE | gnt_color_pair(GNT_COLOR_NORMAL) | A_BOLD,
position);
mvwhline(widget->window, 0, position, ACS_HLINE | gnt_color_pair(GNT_COLOR_NORMAL),
size - position);
}
mvwaddch(widget->window,
slider->vertical ? (size - position - 1) : 0,
slider->vertical ? 0 : position,
ACS_CKBOARD | gnt_color_pair(attr));
}
static void
gnt_slider_size_request(GntWidget *widget)
{
if (GNT_SLIDER(widget)->vertical) {
widget->priv.width = 1;
widget->priv.height = 5;
} else {
widget->priv.width = 5;
widget->priv.height = 1;
}
}
static void
gnt_slider_map(GntWidget *widget)
{
if (widget->priv.width == 0 || widget->priv.height == 0)
gnt_widget_size_request(widget);
GNTDEBUG;
}
static gboolean
step_back(GntBindable *bindable, GList *null)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_advance_step(slider, -1);
return TRUE;
}
static gboolean
small_step_back(GntBindable *bindable, GList *null)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_set_value(slider, slider->current - slider->smallstep);
return TRUE;
}
static gboolean
large_step_back(GntBindable *bindable, GList *null)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_set_value(slider, slider->current - slider->largestep);
return TRUE;
}
static gboolean
step_forward(GntBindable *bindable, GList *list)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_advance_step(slider, 1);
return TRUE;
}
static gboolean
small_step_forward(GntBindable *bindable, GList *null)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_set_value(slider, slider->current + slider->smallstep);
return TRUE;
}
static gboolean
large_step_forward(GntBindable *bindable, GList *null)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_set_value(slider, slider->current + slider->largestep);
return TRUE;
}
static gboolean
move_min_value(GntBindable *bindable, GList *null)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_set_value(slider, slider->min);
return TRUE;
}
static gboolean
move_max_value(GntBindable *bindable, GList *null)
{
GntSlider *slider = GNT_SLIDER(bindable);
gnt_slider_set_value(slider, slider->max);
return TRUE;
}
static void
gnt_slider_class_init(GntSliderClass *klass)
{
GntBindableClass *bindable = GNT_BINDABLE_CLASS(klass);
parent_class = GNT_WIDGET_CLASS(klass);
parent_class->draw = gnt_slider_draw;
parent_class->map = gnt_slider_map;
parent_class->size_request = gnt_slider_size_request;
klass->changed = NULL;
signals[SIG_VALUE_CHANGED] =
g_signal_new("changed",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GntSliderClass, changed),
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_INT);
gnt_bindable_class_register_action(bindable, "step-backward", step_back, GNT_KEY_LEFT, NULL);
gnt_bindable_register_binding(bindable, "step-backward", GNT_KEY_DOWN, NULL);
gnt_bindable_class_register_action(bindable, "step-forward", step_forward, GNT_KEY_RIGHT, NULL);
gnt_bindable_register_binding(bindable, "step-forward", GNT_KEY_UP, NULL);
gnt_bindable_class_register_action(bindable, "small-step-backward", small_step_back, GNT_KEY_CTRL_LEFT, NULL);
gnt_bindable_register_binding(bindable, "small-step-backward", GNT_KEY_CTRL_DOWN, NULL);
gnt_bindable_class_register_action(bindable, "small-step-forward", small_step_forward, GNT_KEY_CTRL_RIGHT, NULL);
gnt_bindable_register_binding(bindable, "small-step-forward", GNT_KEY_CTRL_UP, NULL);
gnt_bindable_class_register_action(bindable, "large-step-backward", large_step_back, GNT_KEY_PGDOWN, NULL);
gnt_bindable_class_register_action(bindable, "large-step-forward", large_step_forward, GNT_KEY_PGUP, NULL);
gnt_bindable_class_register_action(bindable, "min-value", move_min_value, GNT_KEY_HOME, NULL);
gnt_bindable_class_register_action(bindable, "max-value", move_max_value, GNT_KEY_END, NULL);
gnt_style_read_actions(G_OBJECT_CLASS_TYPE(klass), GNT_BINDABLE_CLASS(klass));
}
static void
gnt_slider_init(GTypeInstance *instance, gpointer class)
{
GntWidget *widget = GNT_WIDGET(instance);
GNT_WIDGET_SET_FLAGS(widget, GNT_WIDGET_NO_SHADOW | GNT_WIDGET_NO_BORDER | GNT_WIDGET_CAN_TAKE_FOCUS);
widget->priv.minw = 1;
widget->priv.minh = 1;
GNTDEBUG;
}
/******************************************************************************
* GntSlider API
*****************************************************************************/
GType
gnt_slider_get_type(void)
{
static GType type = 0;
if(type == 0)
{
static const GTypeInfo info = {
sizeof(GntSliderClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc)gnt_slider_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof(GntSlider),
0, /* n_preallocs */
gnt_slider_init, /* instance_init */
NULL /* value_table */
};
type = g_type_register_static(GNT_TYPE_WIDGET,
"GntSlider",
&info, 0);
}
return type;
}
GntWidget *gnt_slider_new(gboolean vertical, int max, int min)
{
GntWidget *widget = g_object_new(GNT_TYPE_SLIDER, NULL);
GntSlider *slider = GNT_SLIDER(widget);
slider->vertical = vertical;
if (vertical) {
GNT_WIDGET_SET_FLAGS(widget, GNT_WIDGET_GROW_Y);
} else {
GNT_WIDGET_SET_FLAGS(widget, GNT_WIDGET_GROW_X);
}
gnt_slider_set_range(slider, max, min);
slider->step = 1;
return widget;
}
void gnt_slider_set_value(GntSlider *slider, int value)
{
int old;
if (slider->current == value)
return;
old = slider->current;
slider->current = value;
sanitize_value(slider);
if (old == slider->current)
return;
redraw_slider(slider);
slider_value_changed(slider);
}
int gnt_slider_get_value(GntSlider *slider)
{
return slider->current;
}
int gnt_slider_advance_step(GntSlider *slider, int steps)
{
gnt_slider_set_value(slider, slider->current + steps * slider->step);
return slider->current;
}
void gnt_slider_set_step(GntSlider *slider, int step)
{
slider->step = step;
}
void gnt_slider_set_small_step(GntSlider *slider, int step)
{
slider->smallstep = step;
}
void gnt_slider_set_large_step(GntSlider *slider, int step)
{
slider->largestep = step;
}
void gnt_slider_set_range(GntSlider *slider, int max, int min)
{
slider->max = MAX(max, min);
slider->min = MIN(max, min);
sanitize_value(slider);
}
static void
update_label(GntSlider *slider, int current_value, GntLabel *label)
{
char value[256];
g_snprintf(value, sizeof(value), "%d/%d", current_value, slider->max);
gnt_label_set_text(label, value);
}
void gnt_slider_reflect_label(GntSlider *slider, GntLabel *label)
{
g_signal_connect(G_OBJECT(slider), "changed", G_CALLBACK(update_label), label);
}