Squish: Cancel wizard early if settings are wrong

Add an error label for the user and stop internal actions
to avoid displaying error message dialogs with less helpful
information.

Change-Id: Ie0d075121fabb56b67300eaf6c0ebde674475b9c
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/squish/squishwizardpages.cpp

@@ -4,10 +4,12 @@
 #include "squishwizardpages.h"
 
 #include "squishfilehandler.h"
+#include "squishplugin.h"
 #include "squishsettings.h"
 #include "squishtools.h"
 #include "squishtr.h"
 
+#include <utils/infolabel.h>
 #include <utils/qtcassert.h>
 
 #include <QApplication>
@@ -47,7 +49,7 @@ SquishToolkitsPage::SquishToolkitsPage()
     resize(400, 300);
     setTitle(Tr::tr("Create New Squish Test Suite"));
 
-    auto layout = new QHBoxLayout(this);
+    auto layout = new QVBoxLayout(this);
     auto groupBox = new QGroupBox(Tr::tr("Available GUI toolkits:"), this);
     auto buttonLayout = new QVBoxLayout(groupBox);
 
@@ -63,6 +65,15 @@ SquishToolkitsPage::SquishToolkitsPage()
     }
     groupBox->setLayout(buttonLayout);
     layout->addWidget(groupBox);
+
+    m_errorLabel = new Utils::InfoLabel(Tr::tr("Invalid Squish settings. Configure Squish "
+                                               "installation path inside "
+                                               "Preferences... > Squish > General to use "
+                                               "this wizard."),
+                                        Utils::InfoLabel::Error, this);
+    m_errorLabel->setVisible(false);
+    layout->addWidget(m_errorLabel);
+
     auto hiddenLineEdit = new QLineEdit(this);
     hiddenLineEdit->setVisible(false);
     layout->addWidget(hiddenLineEdit);
@@ -99,7 +110,13 @@ bool SquishToolkitsPage::handleReject()
 
 void SquishToolkitsPage::delayedInitialize()
 {
+    const auto s = SquishPlugin::squishSettings();
+    const Utils::FilePath server = s->squishPath.filePath().pathAppended(
+                Utils::HostOsInfo::withExecutableSuffix("bin/squishserver"));
+    if (server.isExecutableFile())
         fetchServerSettings();
+    else
+        m_errorLabel->setVisible(true);
 }
 
 void SquishToolkitsPage::fetchServerSettings()

src/plugins/squish/squishwizardpages.h

@@ -13,6 +13,8 @@ class QComboBox;
 class QLineEdit;
 QT_END_NAMESPACE
 
+namespace Utils { class InfoLabel; }
+
 namespace Squish {
 namespace Internal {
 
@@ -43,6 +45,7 @@ private:
 
     QButtonGroup *m_buttonGroup = nullptr;
     QLineEdit *m_hiddenLineEdit = nullptr;
+    Utils::InfoLabel *m_errorLabel = nullptr;
 };
 
 class SquishScriptLanguagePageFactory : public ProjectExplorer::JsonWizardPageFactory