b37d8bf8a6
2005-07-07 Matthias Clasen <mclasen@redhat.com> * gtk/gtkhscale.c (gtk_hscale_new_with_range): (gtk_vscale_new_with_range): Add some additional docs on precision here too. (#309238, Steve Chaplin)
268 lines
7.1 KiB
C
268 lines
7.1 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2001 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include <config.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "gtkvscale.h"
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#include "gtkintl.h"
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#include "gtkalias.h"
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#define VALUE_SPACING 2
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static gpointer parent_class;
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static void gtk_vscale_class_init (GtkVScaleClass *klass);
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static void gtk_vscale_init (GtkVScale *vscale);
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static gboolean gtk_vscale_expose (GtkWidget *widget,
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GdkEventExpose *event);
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static void gtk_vscale_get_layout_offsets (GtkScale *scale,
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gint *x,
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gint *y);
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GType
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gtk_vscale_get_type (void)
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{
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static GType vscale_type = 0;
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if (!vscale_type)
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{
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static const GTypeInfo vscale_info =
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{
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sizeof (GtkVScaleClass),
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NULL, /* base_init */
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NULL, /* base_finalize */
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(GClassInitFunc) gtk_vscale_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GtkVScale),
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0, /* n_preallocs */
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(GInstanceInitFunc) gtk_vscale_init,
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};
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vscale_type = g_type_register_static (GTK_TYPE_SCALE, "GtkVScale",
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&vscale_info, 0);
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}
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return vscale_type;
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}
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static void
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gtk_vscale_class_init (GtkVScaleClass *class)
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{
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GtkWidgetClass *widget_class;
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GtkRangeClass *range_class;
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GtkScaleClass *scale_class;
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widget_class = GTK_WIDGET_CLASS (class);
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range_class = GTK_RANGE_CLASS (class);
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scale_class = GTK_SCALE_CLASS (class);
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parent_class = g_type_class_peek_parent (class);
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range_class->slider_detail = "vscale";
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scale_class->get_layout_offsets = gtk_vscale_get_layout_offsets;
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widget_class->expose_event = gtk_vscale_expose;
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}
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static void
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gtk_vscale_init (GtkVScale *vscale)
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{
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GtkRange *range;
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range = GTK_RANGE (vscale);
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range->orientation = GTK_ORIENTATION_VERTICAL;
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}
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GtkWidget*
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gtk_vscale_new (GtkAdjustment *adjustment)
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{
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return g_object_new (GTK_TYPE_VSCALE, "adjustment", adjustment, NULL);
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}
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/**
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* gtk_vscale_new_with_range:
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* @min: minimum value
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* @max: maximum value
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* @step: step increment (tick size) used with keyboard shortcuts
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*
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* Creates a new vertical scale widget that lets the user input a
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* number between @min and @max (including @min and @max) with the
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* increment @step. @step must be nonzero; it's the distance the
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* slider moves when using the arrow keys to adjust the scale value.
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*
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* Note that the way in which the precision is derived works best if @step
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* is a power of ten. If the resulting precision is not suitable for your
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* needs, use gtk_scale_set_digits() to correct it.
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*
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* Return value: a new #GtkVScale
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**/
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GtkWidget*
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gtk_vscale_new_with_range (gdouble min,
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gdouble max,
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gdouble step)
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{
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GtkObject *adj;
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GtkScale *scale;
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gint digits;
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g_return_val_if_fail (min < max, NULL);
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g_return_val_if_fail (step != 0.0, NULL);
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adj = gtk_adjustment_new (min, min, max, step, 10 * step, 0);
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scale = g_object_new (GTK_TYPE_VSCALE,
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"adjustment", adj,
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NULL);
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if (fabs (step) >= 1.0 || step == 0.0)
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digits = 0;
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else {
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digits = abs ((gint) floor (log10 (fabs (step))));
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if (digits > 5)
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digits = 5;
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}
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gtk_scale_set_digits (scale, digits);
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return GTK_WIDGET (scale);
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}
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static gboolean
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gtk_vscale_expose (GtkWidget *widget,
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GdkEventExpose *event)
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{
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GtkScale *scale;
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scale = GTK_SCALE (widget);
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/* We need to chain up _first_ so the various geometry members of
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* GtkRange struct are updated.
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*/
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if (GTK_WIDGET_CLASS (parent_class)->expose_event)
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GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
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if (scale->draw_value)
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{
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PangoLayout *layout;
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gint x, y;
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GtkStateType state_type;
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layout = gtk_scale_get_layout (scale);
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gtk_scale_get_layout_offsets (scale, &x, &y);
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state_type = GTK_STATE_NORMAL;
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if (!GTK_WIDGET_IS_SENSITIVE (scale))
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state_type = GTK_STATE_INSENSITIVE;
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gtk_paint_layout (widget->style,
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widget->window,
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state_type,
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FALSE,
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NULL,
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widget,
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"vscale",
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x, y,
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layout);
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}
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return FALSE;
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}
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static void
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gtk_vscale_get_layout_offsets (GtkScale *scale,
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gint *x,
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gint *y)
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{
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GtkWidget *widget;
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GtkRange *range;
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PangoLayout *layout;
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PangoRectangle logical_rect;
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gint value_spacing;
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widget = GTK_WIDGET (scale);
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layout = gtk_scale_get_layout (scale);
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if (!layout)
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{
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*x = 0;
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*y = 0;
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return;
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}
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range = GTK_RANGE (widget);
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scale = GTK_SCALE (widget);
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gtk_widget_style_get (widget, "value-spacing", &value_spacing, NULL);
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pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
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switch (scale->value_pos)
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{
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case GTK_POS_LEFT:
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*x = range->range_rect.x - logical_rect.width - value_spacing;
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*y = range->slider_start + (range->slider_end - range->slider_start - logical_rect.height) / 2;
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*y = CLAMP (*y, 0, widget->allocation.height - logical_rect.height);
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break;
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case GTK_POS_RIGHT:
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*x = range->range_rect.x + range->range_rect.width + value_spacing;
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*y = range->slider_start + (range->slider_end - range->slider_start - logical_rect.height) / 2;
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*y = CLAMP (*y, 0, widget->allocation.height - logical_rect.height);
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break;
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case GTK_POS_TOP:
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*x = range->range_rect.x + (range->range_rect.width - logical_rect.width) / 2;
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*y = range->range_rect.y - logical_rect.height - value_spacing;
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break;
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case GTK_POS_BOTTOM:
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*x = range->range_rect.x + (range->range_rect.width - logical_rect.width) / 2;
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*y = range->range_rect.y + range->range_rect.height + value_spacing;
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break;
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default:
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g_return_if_reached ();
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*x = 0;
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*y = 0;
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break;
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}
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*x += widget->allocation.x;
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*y += widget->allocation.y;
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}
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#define __GTK_VSCALE_C__
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#include "gtkaliasdef.c"
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