ProjectExplorer: Allow an extraInit function to be called

... when BuildSteps are created. Potentially useful to tweak
step behavior without the need to inherit or such.

Change-Id: I8c8e9bdec84fafc454db9dc9a492d399b00b7f57
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildstep.h

@@ -3,6 +3,8 @@
 
 #pragma once
 
+#include <qglobal.h>
+
 #include "cmakeabstractprocessstep.h"
 #include <utils/treemodel.h>
 
@@ -39,7 +41,7 @@ public:
     CMakeBuildStep(ProjectExplorer::BuildStepList *bsl, Utils::Id id);
 
     QStringList buildTargets() const;
-    void setBuildTargets(const QStringList &target);
+    void setBuildTargets(const QStringList &target) override;
 
     bool buildsBuildTarget(const QString &target) const;
     void setBuildsBuildTarget(const QString &target, bool on);

src/plugins/projectexplorer/buildstep.cpp

@@ -349,6 +349,11 @@ void BuildStepFactory::setFlags(BuildStep::Flags flags)
     m_flags = flags;
 }
 
+void BuildStepFactory::setExtraInit(const std::function<void (BuildStep *)> &extraInit)
+{
+    m_extraInit = extraInit;
+}
+
 void BuildStepFactory::setSupportedStepList(Id id)
 {
     m_supportedStepLists = {id};
@@ -392,7 +397,7 @@ Id BuildStepFactory::stepId() const
 BuildStep *BuildStepFactory::create(BuildStepList *parent)
 {
     QTC_ASSERT(m_creator, return nullptr);
-    BuildStep *step = m_creator(parent);
+    BuildStep *step = m_creator(this, parent);
     step->setDefaultDisplayName(m_displayName);
     return step;
 }

src/plugins/projectexplorer/buildstep.h

@@ -76,6 +76,8 @@ public:
     QString summaryText() const;
     QWidget *doCreateConfigWidget();
 
+    virtual void setBuildTargets(const QStringList &) {}
+
 signals:
     void updateSummary();
 
@@ -143,15 +145,22 @@ public:
 
     QString displayName() const;
 
-protected:
+    virtual void setBuildTargets(const QStringList &) const {}
-    using BuildStepCreator = std::function<BuildStep *(BuildStepList *)>;
 
-    template <class BuildStepType>
+protected:
+    using BuildStepCreator = std::function<BuildStep *(BuildStepFactory *bsf, BuildStepList *)>;
+
+    template <typename BuildStepType>
     void registerStep(Utils::Id id)
     {
         QTC_CHECK(!m_creator);
         m_stepId = id;
-        m_creator = [id](BuildStepList *bsl) { return new BuildStepType(bsl, id); };
+        m_creator = [id, this](BuildStepFactory *bsf, BuildStepList *bsl) {
+            auto bs = new BuildStepType(bsl, id);
+            if (bsf->m_extraInit)
+                bsf->m_extraInit(bs);
+            return bs;
+        };
     }
     void cloneStepCreator(Utils::Id exitstingStepId, Utils::Id overrideNewStepId = {});
 
@@ -164,6 +173,7 @@ protected:
     void setRepeatable(bool on) { m_isRepeatable = on; }
     void setDisplayName(const QString &displayName);
     void setFlags(BuildStep::Flags flags);
+    void setExtraInit(const std::function<void(BuildStep *)> &extraInit);
 
 private:
     Utils::Id m_stepId;
@@ -176,6 +186,7 @@ private:
     QList<Utils::Id> m_supportedStepLists;
     Utils::Id m_supportedConfiguration;
     bool m_isRepeatable = true;
+    std::function<void(BuildStep *)> m_extraInit;
 };
 
 } // namespace ProjectExplorer