feat(editor): drag-and-drop open file

editor/mainwindow.cpp

@@ -438,6 +438,39 @@ void MainWindow::connectActionHandlers() {
     });
 }
 
+void MainWindow::openFile(std::string path) {
+    // Don't ask for confirmation if running a debug build (makes development easier)
+    #ifdef NDEBUG
+    // Ask if the user wants to save their changes
+    // https://stackoverflow.com/a/33890731
+    QMessageBox msgBox;
+    msgBox.setText("Save changes before creating new document?");
+    msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
+    msgBox.setDefaultButton(QMessageBox::Save);
+    int result = msgBox.exec();
+
+    if (result == QMessageBox::Cancel) return;
+    if (result == QMessageBox::Save) {
+        std::optional<std::string> path;
+        if (!gDataModel->HasFile())
+            path = openFileDialog("Openblocks Level (*.obl)", ".obl", QFileDialog::AcceptSave, QString::fromStdString("Save " + gDataModel->name));
+        if (!path || path == "") return;
+
+        gDataModel->SaveToFile(path);
+    }
+    #endif
+
+    std::shared_ptr<DataModel> newModel = DataModel::LoadFromFile(path);
+    editModeDataModel = newModel;
+    gDataModel = newModel;
+    newModel->Init();
+    ui->explorerView->updateRoot(newModel);
+
+    // Reset running state
+    placeDocument->setRunState(RUN_STOPPED);
+    updateToolbars();
+}
+
 void MainWindow::updateToolbars() {
     ui->actionToolSelect->setChecked(selectedTool == TOOL_SELECT);
     ui->actionToolMove->setChecked(selectedTool == TOOL_MOVE);

editor/mainwindow.h

@@ -57,6 +57,8 @@ public:
     void openScriptDocument(std::shared_ptr<Script>);
     void closeScriptDocument(std::shared_ptr<Script>);
 
+    void openFile(std::string path);
+
     Ui::MainWindow *ui;
 private:
     PlaceDocument* placeDocument;

editor/placedocument.cpp

@@ -9,14 +9,17 @@
 #include <cstdio>
 #include <memory>
 #include <qboxlayout.h>
+#include <qdebug.h>
 #include <qevent.h>
 #include <qmargins.h>
 #include <qmdisubwindow.h>
 #include <qlayout.h>
+#include <qmimedata.h>
 
 PlaceDocument::PlaceDocument(QWidget* parent):
     QMdiSubWindow(parent) {
     placeWidget = new MainGLWidget;
+    setAcceptDrops(true);
     setWidget(placeWidget);
     setWindowTitle("Place");
 
@@ -136,3 +139,18 @@ void PlaceDocument::init() {
     MainWindow* mainWnd = dynamic_cast<MainWindow*>(window());
     // mainWnd->openScriptDocument(script);
 }
+
+void PlaceDocument::dragEnterEvent(QDragEnterEvent* evt) {
+    // https://stackoverflow.com/a/14895393/16255372
+    if (evt->mimeData()->hasUrls()) {
+        evt->acceptProposedAction();
+    }
+}
+
+void PlaceDocument::dropEvent(QDropEvent* evt) {
+    auto urls = evt->mimeData()->urls();
+    if (urls.size() == 0) return;
+    QString fileName = urls[0].toLocalFile();
+    MainWindow* mainWnd = dynamic_cast<MainWindow*>(window());
+    mainWnd->openFile(fileName.toStdString());
+}

editor/placedocument.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "mainglwidget.h"
+#include <qevent.h>
 #include <qmdisubwindow.h>
 #include <QBasicTimer>
 
@@ -25,4 +26,7 @@ public:
   
     void closeEvent(QCloseEvent *closeEvent) override;
     void init();
+protected:
+    void dragEnterEvent(QDragEnterEvent*) override;
+    void dropEvent(QDropEvent*) override;
 };