path: root/widgets/table/e-cell-text.c

/*
 * e-cell-text.c: Text cell renderer
 *
 * Author:
 *   Miguel de Icaza (miguel@kernel.org)
 *
 * (C) 1999 Helix Code, Inc
 */
#include <config.h>
#include <gtk/gtkenums.h>
#include <gtk/gtkentry.h>
#include <gtk/gtkwindow.h>
#include <gtk/gtksignal.h>
#include <gdk/gdkkeysyms.h>
#include <libgnomeui/gnome-canvas.h>
#include <stdio.h>
#include "e-cell-text.h"
#include "e-util.h"
#include "e-table-item.h"

#define PARENT_TYPE e_cell_get_type()

#define TEXT_PAD 2

typedef struct {
    char         *old_text;
    GtkWidget    *entry_top;
    GtkEntry     *entry;

    /*
     * Where the editing is taking place
     */
    int           model_col, view_col, row;
} CellEdit;

typedef struct {
    ECellView    cell_view;
    GdkGC       *gc;
    GdkFont     *font;
    GnomeCanvas *canvas;
    ETableItem  *eti;
    
    /*
     * During edition.
     */
    CellEdit    *edit;
} ECellTextView;

static ECellClass *parent_class;

static void
ect_queue_redraw (ECellTextView *text_view, int view_col, int view_row)
{
    e_table_item_redraw_range (text_view->eti, view_col, view_row, view_col, view_row);
}

/*
 * Accept the currently edited text
 */
static void
ect_accept_edits (ECellTextView *text_view)
{
    const char *text = gtk_entry_get_text (text_view->edit->entry);
    CellEdit *edit = text_view->edit;
    
    e_table_model_set_value_at (text_view->cell_view.table_model, edit->model_col, edit->row, text);
}

/*
 * Shuts down the editing process
 */
static void
ect_stop_editing (ECellTextView *text_view)
{
    CellEdit *edit = text_view->edit;
    
    g_free (edit->old_text);
    edit->old_text = NULL;
    gtk_widget_destroy (edit->entry_top);
    edit->entry_top = NULL;
    edit->entry = NULL;

    g_free (edit);
    
    text_view->edit = NULL;

    e_table_item_leave_edit (text_view->eti);
}

/*
 * Cancels the edits
 */
static void
ect_cancel_edit (ECellTextView *text_view)
{
    ect_queue_redraw (text_view, text_view->edit->view_col, text_view->edit->row);
    ect_stop_editing (text_view);
}

/*
 * ECell::realize method
 */
static ECellView *
ect_realize (ECell *ecell, ETableModel *table_model, void *view)
{
    ECellText *ect = E_CELL_TEXT (ecell);
    ECellTextView *text_view = g_new0 (ECellTextView, 1);
    ETableItem *eti = E_TABLE_ITEM (view);
    GnomeCanvas *canvas = GNOME_CANVAS_ITEM (eti)->canvas;
    
    text_view->cell_view.ecell = ecell;
    text_view->cell_view.table_model = table_model;
    
    text_view->gc = gdk_gc_new (GTK_WIDGET (canvas)->window);
    if (ect->font_name){
        GdkFont *f;

        f = gdk_fontset_load (ect->font_name);
        text_view->font = f;
    }
    if (!text_view->font){
        text_view->font = GTK_WIDGET (canvas)->style->font;
        
        gdk_font_ref (text_view->font);
    }

    text_view->eti = eti;
    text_view->canvas = canvas;
    
    return (ECellView *)text_view;
}

/*
 * ECell::unrealize method
 */
static void
ect_unrealize (ECellView *ecv)
{
    ECellTextView *text_view = (ECellTextView *) ecv;

    gdk_gc_unref (text_view->gc);
    text_view->gc = NULL;

    gdk_font_unref (text_view->font);
    text_view->font = NULL;

    g_free (text_view);
}

/*
 * ECell::draw method
 */
static void
ect_draw (ECellView *ecell_view, GdkDrawable *drawable,
      int model_col, int view_col, int row, gboolean selected,
      int x1, int y1, int x2, int y2)
{
    ECellText *ect = E_CELL_TEXT (ecell_view->ecell);
    ECellTextView *text_view = (ECellTextView *) ecell_view;
    GtkWidget *w = GTK_WIDGET (text_view->canvas);
    GdkRectangle rect;
    const char *str = e_table_model_value_at (ecell_view->table_model, model_col, row);
    GdkFont *font = text_view->font;
    const int height = font->ascent + font->descent;
    int xoff;
    gboolean edit_display = FALSE;

    /*
     * Figure if this cell is being edited
     */
    if (text_view->edit){
        CellEdit *edit = text_view->edit;
        
        if ((edit->view_col == view_col) && (edit->row == row))
            edit_display = TRUE;
    }

    /*
     * Be a nice citizen: clip to the region we are supposed to draw on
     */
    rect.x = x1;
    rect.y = y1;
    rect.width = x2 - x1;
    rect.height = y2 - y1;
    gdk_gc_set_clip_rectangle (text_view->gc, &rect);

    if (edit_display){
        CellEdit *edit = text_view->edit;
        const char *text = gtk_entry_get_text (edit->entry);
        GdkWChar *p, *text_wc = g_new (GdkWChar, strlen (text) + 1);
        int text_wc_len = gdk_mbstowcs (text_wc, text, strlen (text));
        const int cursor_pos = GTK_EDITABLE (edit->entry)->current_pos;
        const int left_len = gdk_text_width_wc (text_view->font, text_wc, cursor_pos);

        text_wc [text_wc_len] = 0;
        /*
         * Paint
         */
        gdk_gc_set_foreground (text_view->gc, &w->style->base [GTK_STATE_NORMAL]);
        gdk_draw_rectangle (drawable, text_view->gc, TRUE,
                    rect.x, rect.y, rect.width, rect.height);
        gdk_gc_set_foreground (text_view->gc, &w->style->text [GTK_STATE_NORMAL]);

        {
            GdkGC *gc = text_view->gc;
            const int y = y2 - font->descent - ((y2-y1-height)/2);
            int px, i;

            /*
             * Border
             */
            x1 += 2;
            x2--;
            
            px = x1;

            /*
             * If the cursor is outside the visible range
             *
             * FIXME: we really want a better behaviour.
             */
            if ((px + left_len) > x2)
                px -= left_len - (x2-x1);
                
            for (i = 0, p = text_wc; *p; p++, i++){
                gdk_draw_text_wc (
                    drawable, font, gc, px, y, p, 1);

                if (i == cursor_pos){
                    gdk_draw_line (
                        drawable, gc,
                        px, y - font->ascent,
                        px, y + font->descent - 1);
                }

                px += gdk_text_width_wc (font, p, 1);
            }

            if (i == cursor_pos){
                gdk_draw_line (
                    drawable, gc,
                    px, y - font->ascent,
                    px, y + font->descent - 1);
            }
        }
        g_free (text_wc);
    } else {
        /*
         * Regular cell
         */
        GdkColor *background, *foreground;
        int width;

        /*
         * Border
         */
        x1++;
        x2--;
        
        /*
         * Compute draw mode
         */
        switch (ect->justify){
        case GTK_JUSTIFY_LEFT:
            xoff = 1;
            break;
            
        case GTK_JUSTIFY_RIGHT:
            width = 1 + gdk_text_width (font, str, strlen (str));
            xoff = (x2 - x1) - width;
            break;
            
        case GTK_JUSTIFY_CENTER:
            xoff = ((x2 - x1) - gdk_text_width (font, str, strlen (str))) / 2;
            break;
        default:
            xoff = 0;
            g_warning ("Can not handle GTK_JUSTIFY_FILL");
            break;
        }
        
        
        if (selected){
            background = &w->style->bg [GTK_STATE_SELECTED];
            foreground = &w->style->text [GTK_STATE_SELECTED];
        } else {
            background = &w->style->base [GTK_STATE_NORMAL];
            foreground = &w->style->text [GTK_STATE_NORMAL];
        }
        
        gdk_gc_set_foreground (text_view->gc, background); 
        gdk_draw_rectangle (drawable, text_view->gc, TRUE,
                    rect.x, rect.y, rect.width, rect.height);
        gdk_gc_set_foreground (text_view->gc, foreground);

        gdk_draw_string (
            drawable, font, text_view->gc,
            x1 + xoff,
            y2 - font->descent - ((y2-y1-height)/2), str);
    }
}

/*
 * Selects the entire string
 */
static void
ect_edit_select_all (ECellTextView *text_view)
{
    g_assert (text_view->edit);
    
    gtk_editable_select_region (GTK_EDITABLE (text_view->edit->entry), 0, -1);
}

/*
 * ECell::event method
 */
static gint
ect_event (ECellView *ecell_view, GdkEvent *event, int model_col, int view_col, int row)
{
    ECellTextView *text_view = (ECellTextView *) ecell_view;
    
    switch (event->type){
    case GDK_BUTTON_PRESS:
        /*
         * Adjust for the border we use
         */
        event->button.x++;
        
        printf ("Button pressed at %g %g\n", event->button.x, event->button.y);
        if (text_view->edit){
            printf ("FIXME: Should handle click here\n");
        } else 
            e_table_item_enter_edit (text_view->eti, view_col, row);
        break;

    case GDK_BUTTON_RELEASE:
        /*
         * Adjust for the border we use
         */
        event->button.x++;
        printf ("Button released at %g %g\n", event->button.x, event->button.y);
        return TRUE;

    case GDK_KEY_PRESS:
        if (event->key.keyval == GDK_Escape){
            ect_cancel_edit (text_view);
            return TRUE;
        }
        
        if (!text_view->edit){
            e_table_item_enter_edit (text_view->eti, view_col, row);
            ect_edit_select_all (text_view);
        }

        gtk_widget_event (GTK_WIDGET (text_view->edit->entry), event);
        ect_queue_redraw (text_view, view_col, row);
        break;
        
    case GDK_KEY_RELEASE:
        break;
        
    default:
        return FALSE;
    }
    return TRUE;
}

/*
 * ECell::height method
 */
static int
ect_height (ECellView *ecell_view, int model_col, int view_col, int row) 
{
    ECellTextView *text_view = (ECellTextView *) ecell_view;
    
    return (text_view->font->ascent + text_view->font->descent) + TEXT_PAD;
}

/*
 * Callback: invoked when the user pressed "enter" on the GtkEntry
 */
static void
ect_entry_activate (GtkEntry *entry, ECellTextView *text_view)
{
    e_table_item_leave_edit (text_view->eti);
}

/*
 * ECellView::enter_edit method
 */
static void *
ect_enter_edit (ECellView *ecell_view, int model_col, int view_col, int row)
{
    ECellTextView *text_view = (ECellTextView *) ecell_view;
    const char *str = e_table_model_value_at (ecell_view->table_model, model_col, row);
    CellEdit *edit;

    edit = g_new (CellEdit, 1);
    text_view->edit = edit;

    edit->model_col = model_col;
    edit->view_col = view_col;
    edit->row = row;
    
    edit->entry = (GtkEntry *) gtk_entry_new ();
    gtk_entry_set_text (edit->entry, str);
    edit->old_text = g_strdup (str);
    gtk_signal_connect (GTK_OBJECT (edit->entry), "activate",
                GTK_SIGNAL_FUNC (ect_entry_activate), text_view);

    /*
     * The hack: create this window off-screen
     */
    edit->entry_top = gtk_window_new (GTK_WINDOW_POPUP);
    gtk_container_add (GTK_CONTAINER (edit->entry_top), GTK_WIDGET (edit->entry));
    gtk_widget_set_uposition (edit->entry_top, 20000, 20000);
    gtk_widget_show_all (edit->entry_top);

    ect_queue_redraw (text_view, view_col, row);
    
    return NULL;
}

/*
 * ECellView::leave_edit method
 */
static void
ect_leave_edit (ECellView *ecell_view, int model_col, int view_col, int row, void *edit_context)
{
    ECellTextView *text_view = (ECellTextView *) ecell_view;

    if (text_view->edit){
        ect_accept_edits (text_view);
        ect_stop_editing (text_view);
    } else {
        /*
         * We did invoke this leave edit internally
         */
    }
}

/*
 * GtkObject::destroy method
 */
static void
ect_destroy (GtkObject *object)
{
    ECellText *ect = E_CELL_TEXT (object);

    g_free (ect->font_name);

    GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static void
e_cell_text_class_init (GtkObjectClass *object_class)
{
    ECellClass *ecc = (ECellClass *) object_class;

    object_class->destroy = ect_destroy;
    
    ecc->realize    = ect_realize;
    ecc->unrealize  = ect_unrealize;
    ecc->draw       = ect_draw;
    ecc->event      = ect_event;
    ecc->height     = ect_height;
    ecc->enter_edit = ect_enter_edit;
    ecc->leave_edit = ect_leave_edit;

    parent_class = gtk_type_class (PARENT_TYPE);
}

E_MAKE_TYPE(e_cell_text, "ECellText", ECellText, e_cell_text_class_init, NULL, PARENT_TYPE);

ECell *
e_cell_text_new (ETableModel *etm, const char *fontname, GtkJustification justify)
{
    ECellText *ect = gtk_type_new (e_cell_text_get_type ());

    ect->font_name = g_strdup (fontname);
    ect->justify = justify;
      
    return (ECell *) ect;
}