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Diffstat (limited to 'examples/viewer-qt.cc')
| -rw-r--r-- | examples/viewer-qt.cc | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/examples/viewer-qt.cc b/examples/viewer-qt.cc new file mode 100644 index 00000000..c3d07040 --- /dev/null +++ b/examples/viewer-qt.cc @@ -0,0 +1,515 @@ +/* Pango + * viewer-qt.cc: Example program to view a UTF-8 encoding file + * using Pango to render result. + * + * Copyright (C) 1999-2000 Red Hat Software + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include <string.h> +#include <stdlib.h> + +#include <qapplication.h> +#include <qcdestyle.h> +#include <qcombobox.h> +#include <qfile.h> +#include <qmenubar.h> +#include <qpopupmenu.h> +#include <qspinbox.h> +#include <qscrollview.h> +#include <qstatusbar.h> +#include <qtextcodec.h> +#include <qtextstream.h> +#include <qtoolbar.h> + +#include <pango/pango.h> +#include <pango/pangox.h> + +#include "viewer-qt.h" + +ViewerPara::ViewerPara (PangoContext *context, const QString &text) +{ + text_ = text.utf8(); + + layout_ = pango_layout_new (context); + pango_layout_set_text (layout_, (char *)(const char *)text_, text_.length()); + height_ = -1; +} + +ViewerPara::~ViewerPara () +{ + pango_layout_unref (layout_); +} + +void +ViewerPara::setWidth (int width) +{ + pango_layout_set_width (layout_, width * PANGO_SCALE); + height_ = -1; +} + +void +ViewerPara::contextChanged () +{ + pango_layout_context_changed (layout_); + height_ = -1; + + PangoContext *context; + PangoAlignment align; + + context = pango_layout_get_context (layout_); + if (pango_context_get_base_dir (context) == PANGO_DIRECTION_LTR) + align = PANGO_ALIGN_LEFT; + else + align = PANGO_ALIGN_RIGHT; + + pango_layout_set_alignment (layout_, align); +} + +int +ViewerPara::height () +{ + if (height_ < 0) + { + PangoRectangle logical_rect; + + pango_layout_get_extents (layout_, NULL, &logical_rect); + height_ = logical_rect.height / PANGO_SCALE; + } + + return height_; +} + +void +ViewerPara::draw (QPainter *painter, GC gc, int y) +{ + QPoint devicePt = painter->xForm (QPoint (0, y)); + + pango_x_render_layout (painter->device()->x11Display(), + painter->device()->handle(), + gc, layout_, 0, devicePt.y()); +} + +unicode_char_t +ViewerPara::getChar (int index) +{ + unicode_char_t result; + + if (unicode_get_utf8 (((const char *)text_) + index, &result)) + return result; + else + return 0; +} + +QRect +ViewerPara::charBounds (int index) +{ + PangoRectangle pos; + + pango_layout_index_to_pos (layout_, index, &pos); + + return QRect (MIN (pos.x, pos.x + pos.width) / PANGO_SCALE, + pos.y / PANGO_SCALE, + ABS (pos.width) / PANGO_SCALE, + pos.height / PANGO_SCALE); +} + +int +ViewerPara::findPoint (int x, int y) +{ + int index; + + bool result = pango_layout_xy_to_index (layout_, + x * PANGO_SCALE, y * PANGO_SCALE, + &index, NULL); + if (result) + return index; + else + return -1; +} + +ViewerView::ViewerView (QWidget *parent, QStatusBar *status) : QScrollView (parent) +{ + status_ = status; + + viewport()->setBackgroundMode( QWidget::PaletteBase ); + + setHScrollBarMode (QScrollView::AlwaysOff); + + context_ = pango_x_get_context (x11Display()); + pango_context_set_lang (context_, "en_US"); + + highlight_para_ = NULL; + highlight_index_ = 0; +} + +ViewerView::~ViewerView () +{ + pango_context_unref (context_); +} + +void +ViewerView::readFile (const QString &name) +{ + QFile file (name); + + file.open (IO_ReadOnly); + QTextStream ts (&file);; + + ts.setCodec (QTextCodec::codecForName ("utf8")); + + while (!ts.atEnd()) + paragraphs_.append (new ViewerPara (context (), ts.readLine())); +} + +void +ViewerView::contextChanged () +{ + QListIterator<ViewerPara> it(paragraphs_); + for (; it.current(); ++it) + it.current()->contextChanged(); + + computeHeight(); + updateContents (0, 0, contentsWidth(), contentsHeight()); +} + +void +ViewerView::setFontDesc (PangoFontDescription *font_desc) +{ + pango_context_set_font_description (context_, font_desc); + contextChanged(); +} + +void +ViewerView::setDirection (PangoDirection base_dir) +{ + QListIterator<ViewerPara> it(paragraphs_); + for (; it.current(); ++it) + it.current()->contextChanged(); + + pango_context_set_base_dir (context_, base_dir); + contextChanged(); +} + +void +ViewerView::drawContents (QPainter *p, int clipx, int clipy, int clipw, int cliph) +{ + XGCValues values; + QRect clip = p->xForm (QRect (clipx, clipy, clipw, cliph)); + + GC gc = XCreateGC (x11Display(), handle(), 0, &values); + + XSetForeground (x11Display(), gc, colorGroup().text().pixel()); + + XRectangle xclip = { clip.x(), clip.y(), clip.width(), clip.height() }; + XSetClipRectangles (x11Display(), gc, 0, 0, &xclip, 1, YXBanded); + + int y = 0; + QListIterator<ViewerPara> it(paragraphs_); + for (; it.current(); ++it) + { + ViewerPara *para = it.current(); + int y_end = y + para->height (); + + if (y_end > clipy && y < clipy + cliph) + para->draw (p, gc, y); + + if (para == highlight_para_) + { + QRect bounds = highlight_para_->charBounds (highlight_index_); + bounds.moveBy (0, y); + bounds = p->xForm (bounds); + + XRectangle xbounds = { bounds.x(), bounds.y(), bounds.width(), bounds.height() }; + + XFillRectangle (x11Display(), p->device()->handle(), gc, + xbounds.x, xbounds.y, xbounds.width, xbounds.height); + + XSetClipRectangles (x11Display(), gc, 0, 0, &xbounds, 1, YXBanded); + XSetForeground (x11Display(), gc, colorGroup().base().pixel()); + + para->draw (p, gc, y); + + XSetForeground (x11Display(), gc, colorGroup().text().pixel()); + XSetClipRectangles (x11Display(), gc, 0, 0, &xclip, 1, YXBanded); + } + + y = y_end; + } + + XFreeGC (x11Display(), gc); +} + +void +ViewerView::computeHeight () +{ + int width = visibleWidth(); + int height = 0; + + QListIterator<ViewerPara> it(paragraphs_); + for (; it.current(); ++it) + { + ViewerPara *para = it.current(); + para->setWidth (width); + height += para->height (); + } + + resizeContents (width, height); + repaintContents (0, 0, contentsWidth(), contentsHeight()); +} + +void +ViewerView::viewportResizeEvent (QResizeEvent *event) +{ + computeHeight (); +} + +void +ViewerView::updateHighlightChar () +{ + if (highlight_para_) + { + int y = 0; + QListIterator<ViewerPara> it(paragraphs_); + + for (; it.current(); ++it) + { + ViewerPara *para = it.current(); + if (para == highlight_para_) + { + QRect bounds = para->charBounds (highlight_index_); + bounds.moveBy (0, y); + updateContents (bounds); + + break; + } + + y += para->height (); + } + } +} + +void +ViewerView::contentsMousePressEvent (QMouseEvent *event) +{ + updateHighlightChar (); + highlight_para_ = NULL; + + int y = 0; + QListIterator<ViewerPara> it(paragraphs_); + for (; it.current(); ++it) + { + ViewerPara *para = it.current(); + int y_end = y + para->height (); + + if (y <= event->y() && event->y() < y_end) + { + int index = para->findPoint (event->x(), event->y() - y); + unicode_char_t wc = para->getChar (index); + + if (index >= 0 && wc) + { + highlight_para_ = para; + highlight_index_ = index; + + if (status_) + { + QString num = QString::number (wc, 16).rightJustify (4, '0'); + + status_->message (QString ("Current char: U+") + num); + } + } + + break; + } + y = y_end; + } + + if (status_ && !highlight_para_) + status_->clear (); + + updateHighlightChar(); +} + +static int +cmp_strings (const void *a, const void *b) +{ + return strcmp (*(const char **)a, *(const char **)b); +} + +ViewerWindow::ViewerWindow () +{ + // Create menu + + file_menu_ = new QPopupMenu (this); + file_menu_->setCheckable (true); + + menuBar()->insertItem ("&File", file_menu_); + + file_menu_->insertItem( "&Quit", qApp, SLOT( closeAllWindows() ), CTRL+Key_Q ); + + right_to_left_item_ = file_menu_->insertItem( "&Right-to-Left", this, SLOT( setRightToLeft() ), 0 ); + + view_ = new ViewerView (this, new QStatusBar (this)); + + setCentralWidget (view_); + + // Create families combo box + + QToolBar *toolbar = new QToolBar ("Font", this); + + family_combo_ = new QComboBox (toolbar); + + gchar **families; + int n_families, i; + + pango_context_list_families (view_->context(), &families, &n_families); + qsort (families, n_families, sizeof(char *), cmp_strings); + + for (i=0; i<n_families; i++) + { + family_combo_->insertItem (families[i]); + if (!strcmp (families[i], "sans")) + family_combo_->setCurrentItem (i); + } + + pango_font_map_free_families (families, n_families); + + QObject::connect (family_combo_, SIGNAL(activated(int)), this, SLOT(fillStyleCombo(int))); + + style_combo_ = new QComboBox (toolbar); + fillStyleCombo (0); + + size_box_ = new QSpinBox (1, 1000, 1, toolbar); + size_box_->setValue (16); + + QObject::connect (family_combo_, SIGNAL(activated(int)), this, SLOT(fontChanged())); + QObject::connect (style_combo_, SIGNAL(activated(int)), this, SLOT(fontChanged())); + QObject::connect (size_box_, SIGNAL(valueChanged(int)), this, SLOT(fontChanged())); + + fontChanged (); + + view_->readFile ("/home/otaylor/devel/pango/examples/HELLO.utf8"); + + resize (500, 500); +} + +static int +compare_font_descriptions (const PangoFontDescription *a, const PangoFontDescription *b) +{ + int val = strcmp (a->family_name, b->family_name); + if (val != 0) + return val; + + if (a->weight != b->weight) + return a->weight - b->weight; + + if (a->style != b->style) + return a->style - b->style; + + if (a->stretch != b->stretch) + return a->stretch - b->stretch; + + if (a->variant != b->variant) + return a->variant - b->variant; + + return 0; +} + +static int +font_description_sort_func (const void *a, const void *b) +{ + return compare_font_descriptions (*(PangoFontDescription **)a, *(PangoFontDescription **)b); +} + +void +ViewerWindow::fillStyleCombo (int index) +{ + QString family = family_combo_->currentText(); + + PangoFontDescription **descs; + int n_descs; + + pango_context_list_fonts (view_->context(), family, &descs, &n_descs); + qsort (descs, n_descs, sizeof(PangoFontDescription *), font_description_sort_func); + + style_combo_->clear(); + for (int i = 0; i < n_descs; i++) + { + PangoFontDescription tmp_desc; + + tmp_desc = *descs[i]; + tmp_desc.family_name = NULL; + tmp_desc.size = 0; + + char *str = pango_font_description_to_string (&tmp_desc); + style_combo_->insertItem (str); + } + + pango_font_descriptions_free (descs, n_descs); +} + +void +ViewerWindow::fontChanged () +{ + QString style = style_combo_->currentText(); + + if (style == "Normal") + style = ""; + else + style += " "; + + QString font_name = (family_combo_->currentText() + " " + + style + + QString::number (size_box_->value())); + + PangoFontDescription *font_desc = pango_font_description_from_string (font_name); + + view_->setFontDesc (font_desc); + + pango_font_description_free (font_desc); +} + +void +ViewerWindow::setRightToLeft () +{ + bool new_value = !file_menu_->isItemChecked (right_to_left_item_); + + file_menu_->setItemChecked (right_to_left_item_, new_value); + view_->setDirection (new_value ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR); +} + +ViewerWindow::~ViewerWindow () +{ + delete view_; +} + +int +main (int argc, char **argv) +{ + QApplication a (argc, argv); + + QApplication::setStyle (new QCDEStyle()); + + ViewerWindow *vw = new ViewerWindow (); + + vw->show(); + + a.connect (&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit())); + return a.exec (); +} + |