gttk_Button.cpp

/*
 *  gttk_Button.cpp
 * -------------------
 *
 * This file is part of the gttk package, a Tk/Tile based theme that uses
 * Gtk/GNOME for drawing.
 *
 * Copyright (C) 2004-2008 by:
 * Georgios Petasis, petasis@iit.demokritos.gr,
 * Software and Knowledge Engineering Laboratory,
 * Institute of Informatics and Telecommunications,
 * National Centre for Scientific Research (NCSR) "Demokritos",
 * Aghia Paraskevi, 153 10, Athens, Greece.
 */

#include "gttk_Utilities.h"
#include "gttk_TkHeaders.h"
#include "gttk_WidgetDefaults.h"

typedef struct {
    Tcl_Obj        *defaultStateObj;
} ButtonElement;

static Ttk_ElementOptionSpec ButtonElementOptions[] = {
    { (char *) "-default", TK_OPTION_ANY, 
        Tk_Offset(ButtonElement, defaultStateObj), (char *) "normal" },
    {NULL}
};

static void ButtonElementGeometry(
    void *clientData, void *elementRecord, Tk_Window tkwin,
    int *widthPtr, int *heightPtr, Ttk_Padding *paddingPtr)
{
    GTTK_WIDGET_CACHE_DEFINITION;
    gint focus_width;
    gint focus_pad;
    GTTK_ENSURE_GTK_STYLE_ENGINE_ACTIVE;
    GtkWidget *widget = gttk_GetButton(wc);
    GTTK_ENSURE_WIDGET_OK;
    gttk_gtk_widget_style_get(widget,
           "focus-line-width", &focus_width,
           "focus-padding",    &focus_pad, NULL);
    *paddingPtr = Ttk_UniformPadding(PushButtonUniformPadding +
                                     focus_width + focus_pad);
}

static void ButtonElementDraw(
    void *clientData, void *elementRecord, Tk_Window tkwin,
    Drawable d, Ttk_Box b, unsigned int state)
{
    GTTK_GTK_DRAWABLE_DEFINITIONS;
    gint width, height;
    gint x, y;
    gint border_width;
    GtkBorder default_border = { 1, 1, 1, 1 };
    GtkBorder default_outside_border = { 0, 0, 0, 0 };
    GtkBorder *tmp_border, *tmp_outside_border;
    gboolean interior_focus;
    gint focus_width;
    gint focus_pad;
    GTTK_ENSURE_GTK_STYLE_ENGINE_ACTIVE;
    GtkWidget *widget = gttk_GetButton(wc);
    ButtonElement *bd = (ButtonElement *) elementRecord;
    GtkButton *button = (GtkButton *) widget;
    GTTK_ENSURE_WIDGET_OK;
    GTTK_STYLE_FROM_WIDGET;
    GTTK_DRAWABLE_FROM_WIDGET;
    GTTK_DEFAULT_BACKGROUND;
    gttk_StateShadowTableLookup(NULL, state, gtkState, gtkShadow,
            GTTK_SECTION_BUTTONS|GTTK_SECTION_ALL);
    GTTK_WIDGET_SET_FOCUS(widget);
    GTTK_WIDGET_SET_DEFAULT(widget, bd->defaultStateObj);
    // gttk_StateInfo(state, gtkState, gtkShadow, tkwin, widget);
    // gttk_gtk_paint_box(style, gdkDrawable, gtkState, gtkShadow, NULL,
    //               widget, has_default ? "buttondefault" : "button",
    //               0, 0, b.width, b.height);
    // gttk_gtk_paint_focus(style, gdkDrawable, gtkState,
    //               NULL, widget, "button", 0, 0, b.width, b.height);

    /*
     * The following was taken from GTK+ button drawing code.
     */
    border_width = ((GtkContainer*) widget)->border_width;
    gttk_gtk_widget_style_get(widget,
           "default-border",         &tmp_border,
           "default-outside-border", &tmp_outside_border,
           "interior-focus",         &interior_focus, NULL);
    if (tmp_border) {
      default_border = *tmp_border;
      gttk_gtk_border_free(tmp_border);
    }
    if (tmp_outside_border) {
      default_outside_border = *tmp_outside_border;
      gttk_gtk_border_free(tmp_outside_border);
    }

    gttk_gtk_widget_style_get(widget,
           "focus-line-width", &focus_width,
           "focus-padding",    &focus_pad, NULL); 
        
    x = b.x + border_width;
    y = b.y + border_width;
    width  = b.width  - border_width * 2;
    height = b.height - border_width * 2;

    if (has_default && button->relief == GTK_RELIEF_NORMAL) {
      gttk_gtk_paint_box(style, gdkDrawable, GTK_STATE_NORMAL, GTK_SHADOW_IN,
              NULL, widget, "buttondefault", x, y, width, height);
      x += default_border.left;
      y += default_border.top;
      width -= default_border.left + default_border.right;
      height -= default_border.top + default_border.bottom;
    } else {
      x += default_outside_border.left;
      y += default_outside_border.top;
      width -= default_outside_border.left + default_outside_border.right;
      height -= default_outside_border.top + default_outside_border.bottom;
    }
     
    if (!interior_focus && (state & TTK_STATE_FOCUS)) {
      x += focus_width + focus_pad;
      y += focus_width + focus_pad;
      width -= 2 * (focus_width + focus_pad);
      height -= 2 * (focus_width + focus_pad);
    }

    if (button->relief != GTK_RELIEF_NONE || (state & TTK_STATE_PRESSED) ||
        (state & TTK_STATE_ACTIVE) ) {
      gttk_gtk_paint_box(style, gdkDrawable, gtkState, gtkShadow, NULL,
             widget, "button", x, y, width, height);
    }
     
    if (state & TTK_STATE_FOCUS) {
      gint child_displacement_x;
      gint child_displacement_y;
      gboolean displace_focus;
      
      gttk_gtk_widget_style_get(widget,
              "child-displacement-y", &child_displacement_y,
              "child-displacement-x", &child_displacement_x,
              "displace-focus",       &displace_focus, NULL);

      if (interior_focus) {
        x += widget->style->xthickness + focus_pad;
        y += widget->style->ythickness + focus_pad;
        width -= 2 * (widget->style->xthickness + focus_pad);
        height -=  2 * (widget->style->ythickness + focus_pad);
      } else {
        x -= focus_width + focus_pad;
        y -= focus_width + focus_pad;
        width += 2 * (focus_width + focus_pad);
        height += 2 * (focus_width + focus_pad);
      }

      if ((state & TTK_STATE_PRESSED) && displace_focus) {
        x += child_displacement_x;
        y += child_displacement_y;
      }

      gttk_gtk_paint_focus(style, gdkDrawable, gtkState, NULL, widget,
              "button", x, y, width, height);
    }

    gttk_CopyGtkPixmapOnToDrawable(gdkDrawable, d, tkwin,
                  0, 0, b.width, b.height, b.x, b.y);
    GTTK_CLEANUP_GTK_DRAWABLE;
}

static Ttk_ElementSpec ButtonElementSpec = {
    TK_STYLE_VERSION_2,
    sizeof(ButtonElement),
    ButtonElementOptions,
    ButtonElementGeometry,
    ButtonElementDraw
};

/*------------------------------------------------------------------------
 * +++ Widget layout.
 */

/*
 * TTK_BEGIN_LAYOUT(ButtonLayout)
 *     TTK_GROUP("Button.border", TTK_FILL_BOTH,
 *         TTK_GROUP("Button.focus", TTK_FILL_BOTH, 
 *                 TTK_NODE("Button.label", TTK_FILL_BOTH))))
 * TTK_END_LAYOUT
 */
TTK_BEGIN_LAYOUT(ButtonLayout)
    TTK_GROUP("Button.border", TTK_FILL_BOTH,
        TTK_GROUP("Button.padding", TTK_FILL_BOTH,
            TTK_NODE("Button.label", TTK_FILL_BOTH)))
TTK_END_LAYOUT

int gttk_Init_Button(Tcl_Interp *interp,
                        gttk_WidgetCache **wc, Ttk_Theme themePtr)
{
    /*
     * Register elements:
     */
    Ttk_RegisterElement(interp, themePtr, "Button.border",
            &ButtonElementSpec, (void *) wc[0]);

    /*
     * Register layouts:
     */
    Ttk_RegisterLayout(themePtr, "TButton", ButtonLayout);
    return TCL_OK;
}; /* gttk_Init_Button */