EditWidget.cpp

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/*
 *  Copyright (C) 2005-2006  The Pentagram Team
 *
 *  This program 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#include "pent_include.h"
#include "EditWidget.h"
#include "ShapeFont.h"
#include "RenderedText.h"
#include "RenderSurface.h"
#include "FontManager.h"
#include "IDataSource.h"
#include "ODataSource.h"
#include "TTFont.h"
#include "encoding.h"

#include "SDL.h"

DEFINE_RUNTIME_CLASSTYPE_CODE(EditWidget,Gump);

EditWidget::EditWidget(int X, int Y, std::string txt, bool gamefont_, int font,
                                           int w, int h, unsigned int maxlength_, bool multiline_)
        : Gump(X, Y, w, h), text(txt), gamefont(gamefont_), fontnum(font),
          maxlength(maxlength_), multiline(multiline_),
          cursor_changed(0), cursor_visible(true), cached_text(0)
{
        cursor = text.size();
}

EditWidget::~EditWidget(void)
{
        delete cached_text;
        cached_text = 0;
}

// Init the gump, call after construction
void EditWidget::InitGump(Gump* newparent, bool take_focus)
{
        Gump::InitGump(newparent, take_focus);

        Pentagram::Font *font = getFont();

        // Y offset is always baseline
        dims.y = -font->getBaseline();

        // No X offset
        dims.x = 0;

        if (gamefont && getFont()->isHighRes()) 
        {
                int x = 0, y = 0, w = 0;
                ScreenSpaceToGumpRect(x, y, w, dims.y, ROUND_OUTSIDE);
        }
}

Pentagram::Font* EditWidget::getFont() const
{
        if (gamefont)
                return FontManager::get_instance()->getGameFont(fontnum, true);
        else
                return FontManager::get_instance()->getTTFont(fontnum);
}

void EditWidget::setText(const std::string& t)
{
        text = t;
        cursor = text.size();
        FORGET_OBJECT(cached_text);
}

void EditWidget::ensureCursorVisible()
{
        cursor_visible = true;
        cursor_changed = SDL_GetTicks();
}

bool EditWidget::textFits(std::string& t)
{
        Pentagram::Font *font = getFont();
        
        unsigned int remaining;
        int width, height;

        int max_width = multiline ? dims.w : 0;
        int max_height = dims.h;
        if (gamefont && font->isHighRes()) {
                int x = 0, y = 0;
                GumpRectToScreenSpace(x, y, max_width, max_height, ROUND_INSIDE);
        }

        font->getTextSize(t, width, height, remaining,
                                          max_width, max_height,
                                          Pentagram::Font::TEXT_LEFT, false);

        if (gamefont && font->isHighRes()) {
                int x = 0, y = 0;
                ScreenSpaceToGumpRect(x, y, width, height, ROUND_OUTSIDE);
        }

        if (multiline)
                return (remaining >= t.size());
        else
                return (width <= dims.w);
}

void EditWidget::renderText()
{
        bool cv = cursor_visible;
        if (!IsFocus()) {
                cv = false;
        } else {
                uint32 now = SDL_GetTicks();
                if (now > cursor_changed + 750) {
                        cv = !cursor_visible;
                        cursor_changed = now;
                }
        }

        if (cv != cursor_visible) {
                FORGET_OBJECT(cached_text);
                cursor_visible = cv;
        }

        if (!cached_text) {
                Pentagram::Font *font = getFont();

                int max_width = multiline ? dims.w : 0;
                int max_height = dims.h;
                if (gamefont && font->isHighRes()) {
                        int x = 0, y = 0;
                        GumpRectToScreenSpace(x, y, max_width, max_height, ROUND_INSIDE);
                }

                unsigned int remaining;
                cached_text = font->renderText(text, remaining,
                                                                           max_width, max_height,
                                                                           Pentagram::Font::TEXT_LEFT,
                                                                           false, cv ? cursor : std::string::npos);
        }
}

// Overloadable method to Paint just this Gump (RenderSurface is relative to this)
void EditWidget::PaintThis(RenderSurface*surf, sint32 lerp_factor, bool scaled)
{
        Gump::PaintThis(surf,lerp_factor, scaled);

        renderText();

        if (scaled && gamefont && getFont()->isHighRes())
        {
                surf->FillAlpha(0xFF,dims.x,dims.y,dims.w, dims.h);
                return;
        }

        cached_text->draw(surf, 0, 0);
}

// Overloadable method to Paint just this gumps unscaled components that require compositing (RenderSurface is relative to parent).
void EditWidget::PaintComposited(RenderSurface* surf, sint32 lerp_factor, sint32 sx, sint32 sy)
{
        Pentagram::Font *font = getFont();

        if (!gamefont || !font->isHighRes()) return;

        int x=0,y=0;
        GumpToScreenSpace(x,y,ROUND_BOTTOMRIGHT);

        cached_text->draw(surf, x, y, true);

        x=dims.x; y=dims.y;
        int w=dims.w, h=dims.h;
        GumpRectToScreenSpace(x, y, w, h, ROUND_OUTSIDE);
        surf->FillAlpha(0x00, x, y, w, h);
}

// don't handle any mouse motion events, so let parent handle them for us.
Gump* EditWidget::OnMouseMotion(int mx, int my)
{
        return 0;
}

bool EditWidget::OnKeyDown(int key, int mod)
{
        switch (key) {
        case SDLK_RETURN:
        case SDLK_KP_ENTER:
                parent->ChildNotify(this, EDIT_ENTER);
                break;
        case SDLK_ESCAPE:
                parent->ChildNotify(this, EDIT_ESCAPE);
                break;
        case SDLK_BACKSPACE:
                if (cursor > 0) {
                        text.erase(--cursor, 1);
                        FORGET_OBJECT(cached_text);
                        ensureCursorVisible();
                }
                break;
        case SDLK_DELETE:
                if (cursor != text.size()) {
                        text.erase(cursor, 1);
                        FORGET_OBJECT(cached_text);
                }
                break;
        case SDLK_LEFT:
                if (cursor > 0) {
                        cursor--;
                        FORGET_OBJECT(cached_text);
                        ensureCursorVisible();
                }
                break;
        case SDLK_RIGHT:
                if (cursor < text.size()) {
                        cursor++;
                        FORGET_OBJECT(cached_text);
                        ensureCursorVisible();
                }
                break;
        default:
                break;
        }

        return true;
}

bool EditWidget::OnKeyUp(int key)
{
        return true;
}


bool EditWidget::OnTextInput(int unicode)
{
        if (maxlength > 0 && text.size() >= maxlength)
                return true;

        char c = 0;
        if (unicode >= 0 && unicode < 256)
                c = Pentagram::reverse_encoding[unicode];
        if (!c) return true;

        std::string newtext = text;
        newtext.insert(cursor, 1, c);

        if (textFits(newtext)) {
                text = newtext;
                cursor++;
                FORGET_OBJECT(cached_text);
        }

        return true;
}

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