PrintPreviewDialog issue on 4K monitor

Cobra91151

Hello!

I have added the print preview feature to my program. The problem is, it displays the preview document not well on the screen resolutions above the 1920x1080.

Example:

Code:

QFont docFont;
docFont.setPointSize(14);
QTextDocument *textDoc = new QTextDocument(this);
textDoc->setDefaultFont(docFont);
textDoc->setPlainText(getHardwareData());

Is there any hint/font to make it look well on all screens resolutions on Windows? Thank you.

Cobra91151

During a debugging process I have found the following issues:

QWindowsMultiFontEngine::loadEngine: CreateFontFromLOGFONT failed for "Courier": error 0x88985002 : Indicates the specified font does not exist.
QWindowsMultiFontEngine::loadEngine: CreateFontFromLOGFONT failed for "Courier": error 0x88985002 : Indicates the specified font does not exist.

Cobra91151

I have fixed the QWindowsMultiFontEngine::loadEngine: CreateFontFromLOGFONT failed for "Courier" issue. The problem was caused by a Unicode character in Peripheral data. Now, the only thing left is to make it look better on 4K.

Cobra91151

I have found some hack to get the toolbar actions from a print preview dialog. By adding some additional logic it fixed the issue.

    QList<QToolBar*> toolbarList = printPreviewDlg->findChildren<QToolBar*>();

    if (!toolbarList.isEmpty()) {
        if (screenSize.width() > 1920 && screenSize.height() > 1080) {
            toolbarList.first()->actions().at(0)->activate(QAction::Trigger);
        } else {
            toolbarList.first()->actions().at(1)->activate(QAction::Trigger);
        }
    }

To detect the screen size I use the native Win API methods. Now, it automatically triggers the Fit to width toolbar option and sets a better preview on 4K monitor. It works depending on the screen size. The issue is resolved.