qt: Add TextWidth() wrapper

In Qt 5.12 and before the QFontMetrics::width() is used and it is
deprecated since Qt 13.0.
In Qt 5.11 the QFontMetrics::horizontalAdvance() was introduced.

src/qt/bitcoinamountfield.cpp

@@ -6,6 +6,7 @@
 
 #include <qt/bitcoinunits.h>
 #include <qt/guiconstants.h>
+#include <qt/guiutil.h>
 #include <qt/qvaluecombobox.h>
 
 #include <QApplication>
@@ -121,7 +122,7 @@ public:
 
             const QFontMetrics fm(fontMetrics());
             int h = lineEdit()->minimumSizeHint().height();
-            int w = fm.width(BitcoinUnits::format(BitcoinUnits::BTC, BitcoinUnits::maxMoney(), false, BitcoinUnits::separatorAlways));
+            int w = GUIUtil::TextWidth(fm, BitcoinUnits::format(BitcoinUnits::BTC, BitcoinUnits::maxMoney(), false, BitcoinUnits::separatorAlways));
             w += 2; // cursor blinking space
 
             QStyleOptionSpinBox opt;

src/qt/bitcoingui.cpp

@@ -1407,7 +1407,7 @@ UnitDisplayStatusBarControl::UnitDisplayStatusBarControl(const PlatformStyle *pl
     const QFontMetrics fm(font());
     for (const BitcoinUnits::Unit unit : units)
     {
-        max_width = qMax(max_width, fm.width(BitcoinUnits::longName(unit)));
+        max_width = qMax(max_width, GUIUtil::TextWidth(fm, BitcoinUnits::longName(unit)));
     }
     setMinimumSize(max_width, 0);
     setAlignment(Qt::AlignRight | Qt::AlignVCenter);

src/qt/guiutil.cpp

@@ -916,7 +916,7 @@ qreal calculateIdealFontSize(int width, const QString& text, QFont font, qreal m
     while(font_size >= minPointSize) {
         font.setPointSizeF(font_size);
         QFontMetrics fm(font);
-        if (fm.width(text) < width) {
+        if (TextWidth(fm, text) < width) {
             break;
         }
         font_size -= 0.5;
@@ -956,4 +956,13 @@ void PolishProgressDialog(QProgressDialog* dialog)
 #endif
 }
 
+int TextWidth(const QFontMetrics& fm, const QString& text)
+{
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
+    return fm.horizontalAdvance(text);
+#else
+    return fm.width(text);
+#endif
+}
+
 } // namespace GUIUtil

src/qt/guiutil.h

@@ -257,6 +257,14 @@ namespace GUIUtil
 
     // Fix known bugs in QProgressDialog class.
     void PolishProgressDialog(QProgressDialog* dialog);
+
+    /**
+     * Returns the distance in pixels appropriate for drawing a subsequent character after text.
+     *
+     * In Qt 5.12 and before the QFontMetrics::width() is used and it is deprecated since Qt 13.0.
+     * In Qt 5.11 the QFontMetrics::horizontalAdvance() was introduced.
+     */
+    int TextWidth(const QFontMetrics& fm, const QString& text);
 } // namespace GUIUtil
 
 #endif // BITCOIN_QT_GUIUTIL_H

src/qt/sendcoinsdialog.cpp

@@ -703,7 +703,7 @@ void SendCoinsDialog::updateSmartFeeLabel()
         int lightness = ui->fallbackFeeWarningLabel->palette().color(QPalette::WindowText).lightness();
         QColor warning_colour(255 - (lightness / 5), 176 - (lightness / 3), 48 - (lightness / 14));
         ui->fallbackFeeWarningLabel->setStyleSheet("QLabel { color: " + warning_colour.name() + "; }");
-        ui->fallbackFeeWarningLabel->setIndent(QFontMetrics(ui->fallbackFeeWarningLabel->font()).width("x"));
+        ui->fallbackFeeWarningLabel->setIndent(GUIUtil::TextWidth(QFontMetrics(ui->fallbackFeeWarningLabel->font()), "x"));
     }
     else
     {

src/qt/splashscreen.cpp

@@ -8,12 +8,12 @@
 
 #include <qt/splashscreen.h>
 
-#include <qt/networkstyle.h>
-
 #include <clientversion.h>
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
 #include <interfaces/wallet.h>
+#include <qt/guiutil.h>
+#include <qt/networkstyle.h>
 #include <ui_interface.h>
 #include <util/system.h>
 #include <util/translation.h>
@@ -75,21 +75,21 @@ SplashScreen::SplashScreen(interfaces::Node& node, Qt::WindowFlags f, const Netw
     // check font size and drawing with
     pixPaint.setFont(QFont(font, 33*fontFactor));
     QFontMetrics fm = pixPaint.fontMetrics();
-    int titleTextWidth = fm.width(titleText);
+    int titleTextWidth = GUIUtil::TextWidth(fm, titleText);
     if (titleTextWidth > 176) {
         fontFactor = fontFactor * 176 / titleTextWidth;
     }
 
     pixPaint.setFont(QFont(font, 33*fontFactor));
     fm = pixPaint.fontMetrics();
-    titleTextWidth  = fm.width(titleText);
+    titleTextWidth  = GUIUtil::TextWidth(fm, titleText);
     pixPaint.drawText(pixmap.width()/devicePixelRatio-titleTextWidth-paddingRight,paddingTop,titleText);
 
     pixPaint.setFont(QFont(font, 15*fontFactor));
 
     // if the version string is too long, reduce size
     fm = pixPaint.fontMetrics();
-    int versionTextWidth  = fm.width(versionText);
+    int versionTextWidth  = GUIUtil::TextWidth(fm, versionText);
     if(versionTextWidth > titleTextWidth+paddingRight-10) {
         pixPaint.setFont(QFont(font, 10*fontFactor));
         titleVersionVSpace -= 5;
@@ -111,7 +111,7 @@ SplashScreen::SplashScreen(interfaces::Node& node, Qt::WindowFlags f, const Netw
         boldFont.setWeight(QFont::Bold);
         pixPaint.setFont(boldFont);
         fm = pixPaint.fontMetrics();
-        int titleAddTextWidth  = fm.width(titleAddText);
+        int titleAddTextWidth  = GUIUtil::TextWidth(fm, titleAddText);
         pixPaint.drawText(pixmap.width()/devicePixelRatio-titleAddTextWidth-10,15,titleAddText);
     }