From 19c5571e0434990cbc529d4bb948e3c2e88cca21 Mon Sep 17 00:00:00 2001
From: Shawn Rutledge <shawn.rutledge@theqtcompany.com>
Date: Mon, 15 Dec 2014 15:23:45 +0100
Subject: initial single-threaded implementation of pdfviewer example

---
 examples/widgets/pdfviewer/main.cpp                | 15 +++++
 examples/widgets/pdfviewer/mainwindow.cpp          | 39 +++++++++++++
 examples/widgets/pdfviewer/mainwindow.h            | 34 +++++++++++
 examples/widgets/pdfviewer/mainwindow.ui           | 67 ++++++++++++++++++++++
 examples/widgets/pdfviewer/pdfviewer.pro           | 12 ++++
 .../widgets/pdfviewer/sequentialpagewidget.cpp     | 63 ++++++++++++++++++++
 examples/widgets/pdfviewer/sequentialpagewidget.h  | 34 +++++++++++
 7 files changed, 264 insertions(+)
 create mode 100644 examples/widgets/pdfviewer/main.cpp
 create mode 100644 examples/widgets/pdfviewer/mainwindow.cpp
 create mode 100644 examples/widgets/pdfviewer/mainwindow.h
 create mode 100644 examples/widgets/pdfviewer/mainwindow.ui
 create mode 100644 examples/widgets/pdfviewer/pdfviewer.pro
 create mode 100644 examples/widgets/pdfviewer/sequentialpagewidget.cpp
 create mode 100644 examples/widgets/pdfviewer/sequentialpagewidget.h

(limited to 'examples')

diff --git a/examples/widgets/pdfviewer/main.cpp b/examples/widgets/pdfviewer/main.cpp
new file mode 100644
index 0000000..51a3f98
--- /dev/null
+++ b/examples/widgets/pdfviewer/main.cpp
@@ -0,0 +1,15 @@
+#include "mainwindow.h"
+#include <QApplication>
+#include <QUrl>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    QStringList args = a.arguments();
+    w.show();
+    if (args.length() > 1)
+        w.open(QUrl::fromLocalFile(args[1]));
+
+    return a.exec();
+}
diff --git a/examples/widgets/pdfviewer/mainwindow.cpp b/examples/widgets/pdfviewer/mainwindow.cpp
new file mode 100644
index 0000000..1316ded
--- /dev/null
+++ b/examples/widgets/pdfviewer/mainwindow.cpp
@@ -0,0 +1,39 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QPdfDocument>
+
+Q_LOGGING_CATEGORY(lcExample, "qt.examples.pdfviewer")
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+    , m_doc(new QPdfDocument(this))
+{
+    ui->setupUi(this);
+    ui->pageWidget->setDocument(m_doc);
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+void MainWindow::open(const QUrl &docLocation)
+{
+    if (docLocation.isLocalFile())
+        m_doc->load(docLocation.toLocalFile());
+    else {
+        qCDebug(lcExample) << docLocation << "is not a valid local file";
+        QMessageBox::critical(this, tr("Failed to open"), tr("%1 is not a valid local file").arg(docLocation.toString()));
+    }
+}
+
+void MainWindow::on_actionOpen_triggered()
+{
+    QUrl toOpen = QFileDialog::getOpenFileUrl(this);
+    if (toOpen.isValid())
+        open(toOpen);
+}
diff --git a/examples/widgets/pdfviewer/mainwindow.h b/examples/widgets/pdfviewer/mainwindow.h
new file mode 100644
index 0000000..e31f0b9
--- /dev/null
+++ b/examples/widgets/pdfviewer/mainwindow.h
@@ -0,0 +1,34 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QLoggingCategory>
+
+Q_DECLARE_LOGGING_CATEGORY(lcExample)
+
+namespace Ui {
+class MainWindow;
+}
+
+class QPdfDocument;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
+public slots:
+    void open(const QUrl &docLocation);
+
+private slots:
+    void on_actionOpen_triggered();
+
+private:
+    Ui::MainWindow *ui;
+    QPdfDocument *m_doc;
+};
+
+#endif // MAINWINDOW_H
diff --git a/examples/widgets/pdfviewer/mainwindow.ui b/examples/widgets/pdfviewer/mainwindow.ui
new file mode 100644
index 0000000..16994fa
--- /dev/null
+++ b/examples/widgets/pdfviewer/mainwindow.ui
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralWidget">
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <widget class="SequentialPageWidget" name="pageWidget" native="true"/>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menuBar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>400</width>
+     <height>19</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuFile">
+    <property name="title">
+     <string>File</string>
+    </property>
+    <addaction name="actionOpen"/>
+   </widget>
+   <addaction name="menuFile"/>
+  </widget>
+  <widget class="QToolBar" name="mainToolBar">
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionOpen"/>
+  </widget>
+  <widget class="QStatusBar" name="statusBar"/>
+  <action name="actionOpen">
+   <property name="text">
+    <string>Open...</string>
+   </property>
+  </action>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <customwidgets>
+  <customwidget>
+   <class>SequentialPageWidget</class>
+   <extends>QWidget</extends>
+   <header>sequentialpagewidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/examples/widgets/pdfviewer/pdfviewer.pro b/examples/widgets/pdfviewer/pdfviewer.pro
new file mode 100644
index 0000000..47a13f5
--- /dev/null
+++ b/examples/widgets/pdfviewer/pdfviewer.pro
@@ -0,0 +1,12 @@
+QT       += core gui widgets pdf
+TARGET = pdfviewer
+TEMPLATE = app
+
+SOURCES += main.cpp\
+        mainwindow.cpp \
+    sequentialpagewidget.cpp
+
+HEADERS  += mainwindow.h \
+    sequentialpagewidget.h
+
+FORMS    += mainwindow.ui
diff --git a/examples/widgets/pdfviewer/sequentialpagewidget.cpp b/examples/widgets/pdfviewer/sequentialpagewidget.cpp
new file mode 100644
index 0000000..5de4f2e
--- /dev/null
+++ b/examples/widgets/pdfviewer/sequentialpagewidget.cpp
@@ -0,0 +1,63 @@
+#include "sequentialpagewidget.h"
+#include <QPaintEvent>
+#include <QPainter>
+#include <QPdfDocument>
+#include <QGuiApplication>
+#include <QScreen>
+#include <QLoggingCategory>
+
+Q_DECLARE_LOGGING_CATEGORY(lcExample)
+
+SequentialPageWidget::SequentialPageWidget(QWidget *parent)
+    : QWidget(parent)
+    , m_doc(Q_NULLPTR)
+    , m_background(Qt::darkGray)
+    , m_pageSpacing(3)
+    , m_zoom(1.)
+    , m_top(0.)
+    , m_screenResolution(QGuiApplication::primaryScreen()->logicalDotsPerInch() / 72.0)
+{
+}
+
+SequentialPageWidget::~SequentialPageWidget()
+{
+
+}
+
+void SequentialPageWidget::setDocument(QPdfDocument *doc)
+{
+    m_doc = doc;
+}
+
+void SequentialPageWidget::setZoom(qreal factor)
+{
+    m_zoom = factor;
+    m_pageCache.clear();
+    update();
+}
+
+void SequentialPageWidget::paintEvent(QPaintEvent * event)
+{
+    QPainter painter(this);
+    if (!m_doc) {
+        painter.drawText(rect(), Qt::AlignCenter, tr("no document loaded"));
+        return;
+    }
+
+    painter.fillRect(event->rect(), m_background);
+    qCDebug(lcExample) << event->rect() << m_doc->pageCount();
+
+    int page = 0; // qFloor(m_top);
+    int y = 0; // TODO event->rect().top();
+    while (y < event->rect().bottom() && page < m_doc->pageCount()) {
+        QSizeF size = m_doc->pageSize(page) * m_screenResolution * m_zoom;
+        if (!m_pageCache.contains(page)) {
+            qCDebug(lcExample) << "rendering page" << page << "to size" << size;
+            m_pageCache.insert(page, QPixmap::fromImage(m_doc->render(page, size)));
+        }
+        const QPixmap &pm = m_pageCache[page];
+        painter.drawPixmap(0, y, pm);
+        y += pm.height() + m_pageSpacing;
+        ++page;
+    }
+}
diff --git a/examples/widgets/pdfviewer/sequentialpagewidget.h b/examples/widgets/pdfviewer/sequentialpagewidget.h
new file mode 100644
index 0000000..6741fe3
--- /dev/null
+++ b/examples/widgets/pdfviewer/sequentialpagewidget.h
@@ -0,0 +1,34 @@
+#ifndef SEQUENTIALPAGEWIDGET_H
+#define SEQUENTIALPAGEWIDGET_H
+
+#include <QWidget>
+
+class QPdfDocument;
+
+class SequentialPageWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit SequentialPageWidget(QWidget *parent = 0);
+    ~SequentialPageWidget();
+
+    void paintEvent(QPaintEvent * event);
+
+public slots:
+    void setDocument(QPdfDocument *doc);
+    void setZoom(qreal factor);
+
+private:
+    void render(int page);
+
+private:
+    QPdfDocument *m_doc;
+    QHash<int, QPixmap> m_pageCache;
+    QBrush m_background;
+    int m_pageSpacing;
+    qreal m_zoom;
+    qreal m_top; // 1.5 means start from the bottom half of page 1
+    qreal m_screenResolution; // pixels per point
+};
+
+#endif // SEQUENTIALPAGEWIDGET_H
-- 
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