qt: Unify AboutDialog and HelpMessageDialog

They share so much code and functionality that they may as well
be one class.

src/Makefile.qt.include

@@ -76,7 +76,6 @@ QT_TS = \
   qt/locale/bitcoin_zh_TW.ts
 
 QT_FORMS_UI = \
-  qt/forms/aboutdialog.ui \
   qt/forms/addressbookpage.ui \
   qt/forms/askpassphrasedialog.ui \
   qt/forms/coincontroldialog.ui \

src/qt/bitcoingui.cpp

@@ -549,8 +549,7 @@ void BitcoinGUI::aboutClicked()
     if(!clientModel)
         return;
 
-    AboutDialog dlg(this);
-    dlg.setModel(clientModel);
+    HelpMessageDialog dlg(this, true);
     dlg.exec();
 }
 

src/qt/forms/aboutdialog.ui

@@ -1,130 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>AboutDialog</class>
- <widget class="QDialog" name="AboutDialog">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>593</width>
-    <height>319</height>
-   </rect>
-  </property>
-  <property name="windowTitle">
-   <string>About Bitcoin Core</string>
-  </property>
-  <layout class="QHBoxLayout" name="horizontalLayout_2">
-   <item>
-    <widget class="QLabel" name="label_4">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Preferred" vsizetype="Ignored">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-     <property name="pixmap">
-      <pixmap resource="../bitcoin.qrc">:/images/about</pixmap>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <layout class="QVBoxLayout" name="verticalLayout_2">
-     <item>
-      <spacer name="verticalSpacer_2">
-       <property name="orientation">
-        <enum>Qt::Vertical</enum>
-       </property>
-       <property name="sizeHint" stdset="0">
-        <size>
-         <width>20</width>
-         <height>40</height>
-        </size>
-       </property>
-      </spacer>
-     </item>
-     <item>
-      <widget class="QLabel" name="versionLabel">
-       <property name="cursor">
-        <cursorShape>IBeamCursor</cursorShape>
-       </property>
-       <property name="text">
-        <string notr="true">
-(placeholder for version message)
-        </string>
-       </property>
-       <property name="textFormat">
-        <enum>Qt::RichText</enum>
-       </property>
-       <property name="wordWrap">
-        <bool>true</bool>
-       </property>
-       <property name="textInteractionFlags">
-        <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <spacer name="verticalSpacer">
-       <property name="orientation">
-        <enum>Qt::Vertical</enum>
-       </property>
-       <property name="sizeHint" stdset="0">
-        <size>
-         <width>20</width>
-         <height>40</height>
-        </size>
-       </property>
-      </spacer>
-     </item>
-     <item>
-      <widget class="QDialogButtonBox" name="buttonBox">
-       <property name="orientation">
-        <enum>Qt::Horizontal</enum>
-       </property>
-       <property name="standardButtons">
-        <set>QDialogButtonBox::Ok</set>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
-  </layout>
- </widget>
- <resources>
-  <include location="../bitcoin.qrc"/>
- </resources>
- <connections>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>accepted()</signal>
-   <receiver>AboutDialog</receiver>
-   <slot>accept()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>20</x>
-     <y>20</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>20</x>
-     <y>20</y>
-    </hint>
-   </hints>
-  </connection>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>rejected()</signal>
-   <receiver>AboutDialog</receiver>
-   <slot>reject()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>20</x>
-     <y>20</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>20</x>
-     <y>20</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
-</ui>

src/qt/forms/helpmessagedialog.ui

@@ -16,7 +16,7 @@
    </font>
   </property>
   <property name="windowTitle">
-   <string>Bitcoin Core - Command-line options</string>
+   <string notr="true">Bitcoin Core - Command-line options</string>
   </property>
   <layout class="QHBoxLayout" name="horizontalLayout_2">
    <item>
@@ -54,11 +54,6 @@
         <layout class="QVBoxLayout" name="verticalLayout_2">
          <item>
           <widget class="QLabel" name="helpMessageLabel">
-           <property name="font">
-            <font>
-             <family>Terminal</family>
-            </font>
-           </property>
            <property name="cursor">
             <cursorShape>IBeamCursor</cursorShape>
            </property>

src/qt/utilitydialog.cpp

@@ -4,7 +4,6 @@
 
 #include "utilitydialog.h"
 
-#include "ui_aboutdialog.h"
 #include "ui_helpmessagedialog.h"
 
 #include "bitcoingui.h"
@@ -19,19 +18,15 @@
 #include <QRegExp>
 #include <QVBoxLayout>
 
-/** "About" dialog box */
-AboutDialog::AboutDialog(QWidget *parent) :
+/** "Help message" or "About" dialog box */
+HelpMessageDialog::HelpMessageDialog(QWidget *parent, bool about) :
     QDialog(parent),
-    ui(new Ui::AboutDialog)
+    ui(new Ui::HelpMessageDialog)
 {
     ui->setupUi(this);
-}
+    GUIUtil::restoreWindowGeometry("nHelpMessageDialogWindow", this->size(), this);
 
-void AboutDialog::setModel(ClientModel *model)
-{
-    if(model)
-    {
-        QString version = tr("Bitcoin Core") + " " + tr("version") + " " + model->formatFullVersion();
+    QString version = tr("Bitcoin Core") + " " + tr("version") + " " + QString::fromStdString(FormatFullVersion());
     /* On x86 add a bit specifier to the version so that users can distinguish between
      * 32 and 64 bit builds. On other architectures, 32/64 bit may be more ambigious.
      */
@@ -41,38 +36,27 @@ void AboutDialog::setModel(ClientModel *model)
     version += " " + tr("(%1-bit)").arg(32);
 #endif
 
+    if (about)
+    {
+        setWindowTitle(tr("About Bitcoin Core"));
+
         /// HTML-format the license message from the core
         QString licenseInfo = QString::fromStdString(LicenseInfo());
+        QString licenseInfoHTML = licenseInfo;
         // Make URLs clickable
         QRegExp uri("<(.*)>", Qt::CaseSensitive, QRegExp::RegExp2);
         uri.setMinimal(true); // use non-greedy matching
-        licenseInfo = licenseInfo.replace(uri, "<a href=\"\\1\">\\1</a>");
+        licenseInfoHTML.replace(uri, "<a href=\"\\1\">\\1</a>");
         // Replace newlines with HTML breaks
-        licenseInfo = licenseInfo.replace("\n\n", "<br><br>");
-
-        ui->versionLabel->setText(version + "<br><br>" + licenseInfo);
-    }
-}
-
-AboutDialog::~AboutDialog()
-{
-    delete ui;
-}
-
-void AboutDialog::on_buttonBox_accepted()
-{
-    close();
-}
-
-/** "Help message" dialog box */
-HelpMessageDialog::HelpMessageDialog(QWidget *parent, bool versionOnly) :
-    QDialog(parent),
-    ui(new Ui::HelpMessageDialog)
-{
-    ui->setupUi(this);
-    GUIUtil::restoreWindowGeometry("nHelpMessageDialogWindow", this->size(), this);
-
-    QString version = tr("Bitcoin Core") + " " + tr("version") + " " + QString::fromStdString(FormatFullVersion());
+        licenseInfoHTML.replace("\n\n", "<br><br>");
+
+        ui->helpMessageLabel->setTextFormat(Qt::RichText);
+        ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+        text = version + "\n" + licenseInfo;
+        ui->helpMessageLabel->setText(version + "<br><br>" + licenseInfoHTML);
+        ui->helpMessageLabel->setWordWrap(true);
+    } else {
+        setWindowTitle(tr("Command-line options"));
         QString header = tr("Usage:") + "\n" +
             "  bitcoin-qt [" + tr("command-line options") + "]                     " + "\n";
 
@@ -86,12 +70,9 @@ HelpMessageDialog::HelpMessageDialog(QWidget *parent, bool versionOnly) :
             "  -splash                   " + tr("Show splash screen on startup (default: 1)");
 
         ui->helpMessageLabel->setFont(GUIUtil::bitcoinAddressFont());
-
-    // Set help message text
-    if(versionOnly)
-        ui->helpMessageLabel->setText(version + "\n" + QString::fromStdString(LicenseInfo()));
-    else
-        ui->helpMessageLabel->setText(version + "\n" + header + "\n" + coreOptions + "\n" + uiOptions);
+        text = version + "\n" + header + "\n" + coreOptions + "\n" + uiOptions;
+        ui->helpMessageLabel->setText(text);
+    }
 }
 
 HelpMessageDialog::~HelpMessageDialog()
@@ -103,7 +84,7 @@ HelpMessageDialog::~HelpMessageDialog()
 void HelpMessageDialog::printToConsole()
 {
     // On other operating systems, the expected action is to print the message to the console.
-    fprintf(stdout, "%s\n", qPrintable(ui->helpMessageLabel->text()));
+    fprintf(stdout, "%s\n", qPrintable(text));
 }
 
 void HelpMessageDialog::showOrPrint()

src/qt/utilitydialog.h

@@ -12,35 +12,16 @@ class BitcoinGUI;
 class ClientModel;
 
 namespace Ui {
-    class AboutDialog;
     class HelpMessageDialog;
 }
 
-/** "About" dialog box */
-class AboutDialog : public QDialog
-{
-    Q_OBJECT
-
-public:
-    explicit AboutDialog(QWidget *parent);
-    ~AboutDialog();
-
-    void setModel(ClientModel *model);
-
-private:
-    Ui::AboutDialog *ui;
-
-private slots:
-    void on_buttonBox_accepted();
-};
-
 /** "Help message" dialog box */
 class HelpMessageDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit HelpMessageDialog(QWidget *parent, bool versionOnly);
+    explicit HelpMessageDialog(QWidget *parent, bool about);
     ~HelpMessageDialog();
 
     void printToConsole();
@@ -48,6 +29,7 @@ public:
 
 private:
     Ui::HelpMessageDialog *ui;
+    QString text;
 
 private slots:
     void on_okButton_accepted();