display selected file in a QTabWidget

Add VTabWidget and VEdit to display content of files.

Signed-off-by: Le Tan <tamlokveer@gmail.com>

VNote.pro

@@ -20,7 +20,9 @@ SOURCES += main.cpp\
     vnewdirdialog.cpp \
     vconfigmanager.cpp \
     vfilelist.cpp \
-    vnewfiledialog.cpp
+    vnewfiledialog.cpp \
+    vtabwidget.cpp \
+    vedit.cpp
 
 HEADERS  += vmainwindow.h \
     vdirectorytree.h \
@@ -29,7 +31,9 @@ HEADERS  += vmainwindow.h \
     vnewdirdialog.h \
     vconfigmanager.h \
     vfilelist.h \
-    vnewfiledialog.h
+    vnewfiledialog.h \
+    vtabwidget.h \
+    vedit.h
 
 RESOURCES += \
     vnote.qrc

vedit.cpp

@@ -0,0 +1,45 @@
+#include <QtWidgets>
+#include "vedit.h"
+
+VEdit::VEdit(const QString &path, const QString &name,
+             QWidget *parent) : QTextEdit(parent), path(path), name(name)
+{
+    fileText = readFile(QDir(path).filePath(name));
+    showTextReadMode();
+}
+
+void VEdit::showTextReadMode()
+{
+    setText(fileText);
+    setReadOnly(true);
+}
+
+QString VEdit::readFile(const QString &filePath)
+{
+    QFile file(filePath);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        qWarning() << "error: fail to read file" << filePath;
+        return QString();
+    }
+    QString fileText(file.readAll());
+    file.close();
+    return fileText;
+}
+
+bool VEdit::writeFile(const QString &filePath, const QString &text)
+{
+    QFile file(filePath);
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
+        qWarning() << "error: fail to open file" << filePath << "to write to";
+        return false;
+    }
+    QTextStream stream(&file);
+    stream << text;
+    file.close();
+    return true;
+}
+
+bool VEdit::requestClose()
+{
+    return true;
+}

vedit.h

@@ -0,0 +1,30 @@
+#ifndef VEDIT_H
+#define VEDIT_H
+
+#include <QTextEdit>
+#include <QString>
+
+class VEdit : public QTextEdit
+{
+    Q_OBJECT
+public:
+    explicit VEdit(const QString &path, const QString &name,
+                   QWidget *parent = 0);
+    bool requestClose();
+
+signals:
+
+public slots:
+
+
+private:
+    QString readFile(const QString &filePath);
+    bool writeFile(const QString &filePath, const QString &text);
+    void showTextReadMode();
+
+    QString path;
+    QString name;
+    QString fileText;
+};
+
+#endif // VEDIT_H

vmainwindow.cpp

@@ -3,6 +3,7 @@
 #include "vdirectorytree.h"
 #include "vnote.h"
 #include "vfilelist.h"
+#include "vtabwidget.h"
 
 VMainWindow::VMainWindow(QWidget *parent)
     : QMainWindow(parent)
@@ -45,24 +46,15 @@ void VMainWindow::setupUI()
     fileList->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Expanding);
 
     // Editor tab widget
-    editorTabWidget = new QTabWidget();
+    tabs = new VTabWidget(VNote::welcomePageUrl);
-    editorTabWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+    tabs->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
-    editorTabWidget->setTabBarAutoHide(true);
+    tabs->setTabBarAutoHide(true);
-    QFile welcomeFile(":/resources/welcome.html");
-    QString welcomeText("Welcome to VNote!");
-    if (welcomeFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
-        welcomeText = QString(welcomeFile.readAll());
-        welcomeFile.close();
-    }
-    QTextBrowser *welcomePage = new QTextBrowser();
-    welcomePage->setHtml(welcomeText);
-    editorTabWidget->addTab(welcomePage, tr("Welcome to VNote"));
 
     // Main Splitter
     mainSplitter = new QSplitter();
     mainSplitter->addWidget(nbContainer);
     mainSplitter->addWidget(fileList);
-    mainSplitter->addWidget(editorTabWidget);
+    mainSplitter->addWidget(tabs);
     mainSplitter->setStretchFactor(0, 1);
     mainSplitter->setStretchFactor(1, 1);
     mainSplitter->setStretchFactor(2, 10);
@@ -74,6 +66,8 @@ void VMainWindow::setupUI()
             SLOT(setTreePath(const QString&)));
     connect(directoryTree, &VDirectoryTree::currentDirectoryChanged,
             fileList, &VFileList::setDirectory);
+    connect(fileList, &VFileList::currentFileChanged,
+            tabs, &VTabWidget::openFile);
 
     setCentralWidget(mainSplitter);
     // Create and show the status bar

vmainwindow.h

@@ -11,6 +11,7 @@ class QListWidget;
 class QTabWidget;
 class VNote;
 class VFileList;
+class VTabWidget;
 
 class VMainWindow : public QMainWindow
 {
@@ -36,7 +37,7 @@ private:
     QComboBox *notebookComboBox;
     VDirectoryTree *directoryTree;
     VFileList *fileList;
-    QTabWidget *editorTabWidget;
+    VTabWidget *tabs;
     QSplitter *mainSplitter;
     VNote *vnote;
 };

vnote.cpp

@@ -4,6 +4,7 @@
 
 const QString VNote::orgName = QString("tamlok");
 const QString VNote::appName = QString("VNote");
+const QString VNote::welcomePageUrl = QString(":/resources/welcome.html");
 
 VNote::VNote()
     : curNotebookIndex(0)

vnote.h

@@ -19,6 +19,7 @@ public:
 
     static const QString orgName;
     static const QString appName;
+    static const QString welcomePageUrl;
 
 private:
     // Write notebooks section of global config

vtabwidget.cpp

@@ -0,0 +1,94 @@
+#include <QtWidgets>
+#include <QtDebug>
+#include "vtabwidget.h"
+#include "vedit.h"
+
+VTabWidget::VTabWidget(const QString &welcomePageUrl, QWidget *parent)
+    : QTabWidget(parent), welcomePageUrl(welcomePageUrl)
+{
+    setTabsClosable(true);
+    connect(tabBar(), &QTabBar::tabCloseRequested,
+            this, &VTabWidget::handleTabCloseRequest);
+
+    openWelcomePage();
+}
+
+void VTabWidget::openWelcomePage()
+{
+    int idx = openFileInTab(welcomePageUrl, "");
+    setTabText(idx, "Welcome to VNote");
+    setTabToolTip(idx, "VNote");
+}
+
+int VTabWidget::insertTabWithData(int index, QWidget *page, const QString &label,
+                                  const QJsonObject &tabData)
+{
+    int idx = insertTab(index, page, label);
+    QTabBar *tabs = tabBar();
+    tabs->setTabData(idx, tabData);
+    Q_ASSERT(tabs->tabText(idx) == label);
+    return idx;
+}
+
+int VTabWidget::appendTabWithData(QWidget *page, const QString &label, const QJsonObject &tabData)
+{
+    return insertTabWithData(count(), page, label, tabData);
+}
+
+void VTabWidget::openFile(QJsonObject fileJson)
+{
+    if (fileJson.isEmpty()) {
+        return;
+    }
+    qDebug() << "open file:" << fileJson;
+
+    QString path = fileJson["path"].toString();
+    QString name = fileJson["name"].toString();
+
+    // Find if it has been opened already
+    int idx = findTabByFile(path, name);
+    if (idx > -1) {
+        setCurrentIndex(idx);
+        return;
+    }
+
+    idx = openFileInTab(path, name);
+
+    setCurrentIndex(idx);
+}
+
+int VTabWidget::openFileInTab(const QString &path, const QString &name)
+{
+    VEdit *edit = new VEdit(path, name);
+    QJsonObject tabJson;
+    tabJson["path"] = path;
+    tabJson["name"] = name;
+    int idx = appendTabWithData(edit, name, tabJson);
+    setTabToolTip(idx, path);
+    return idx;
+}
+
+int VTabWidget::findTabByFile(const QString &path, const QString &name)
+{
+    QTabBar *tabs = tabBar();
+    int nrTabs = tabs->count();
+
+    for (int i = 0; i < nrTabs; ++i) {
+        QJsonObject tabJson = tabs->tabData(i).toJsonObject();
+        if (tabJson["name"] == name && tabJson["path"] == path) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+void VTabWidget::handleTabCloseRequest(int index)
+{
+    qDebug() << "request closing tab" << index;
+    VEdit *edit = dynamic_cast<VEdit *>(widget(index));
+    bool ok = edit->requestClose();
+    if (ok) {
+        removeTab(index);
+        delete edit;
+    }
+}

vtabwidget.h

@@ -0,0 +1,31 @@
+#ifndef VTABWIDGET_H
+#define VTABWIDGET_H
+
+#include <QTabWidget>
+#include <QJsonObject>
+#include <QString>
+
+class VTabWidget : public QTabWidget
+{
+    Q_OBJECT
+public:
+    explicit VTabWidget(const QString &welcomePageUrl, QWidget *parent = 0);
+
+signals:
+
+public slots:
+    void openFile(QJsonObject fileJson);
+
+private slots:
+    void handleTabCloseRequest(int index);
+
+private:
+    void openWelcomePage();
+    int insertTabWithData(int index, QWidget *page, const QString &label, const QJsonObject &tabData);
+    int appendTabWithData(QWidget *page, const QString &label, const QJsonObject &tabData);
+    int findTabByFile(const QString &path, const QString &name);
+    int openFileInTab(const QString &path, const QString &name);
+    QString welcomePageUrl;
+};
+
+#endif // VTABWIDGET_H