1 files changed, 143 insertions, 0 deletions
diff --git a/SQLiteStudio3/guiSQLiteStudio/sqlcompareview.cpp b/SQLiteStudio3/guiSQLiteStudio/sqlcompareview.cpp
new file mode 100644
index 0000000..0b5b91d
--- /dev/null
+++ b/SQLiteStudio3/guiSQLiteStudio/sqlcompareview.cpp
@@ -0,0 +1,143 @@
+#include "sqlcompareview.h"
+#include "sqlview.h"
+#include "common/utils.h"
+#include "diff/diff_match_patch.h"
+#include "sqlitesyntaxhighlighter.h"
+#include <QHeaderView>
+#include <QDebug>
+
+SqlCompareView::SqlCompareView(QWidget *parent) :
+    QTableWidget(parent)
+{
+    setColumnCount(2);
+    setVerticalScrollMode(ScrollPerPixel);
+    horizontalHeader()->setSectionResizeMode(0, QHeaderView::Stretch);
+    horizontalHeader()->setSectionResizeMode(1, QHeaderView::Stretch);
+    horizontalHeader()->setVisible(false);
+//    verticalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
+    diff = new diff_match_patch;
+}
+
+void SqlCompareView::setSides(const QList<QPair<QString, QString>>& data)
+{
+    setRowCount(data.size());
+
+    int row = 0;
+    SqlView* leftView = nullptr;
+    SqlView* rightView = nullptr;
+    for (const QPair<QString, QString>& rowData : data)
+    {
+        leftView = new SqlView();
+        leftView->setFrameStyle(QFrame::NoFrame);
+        leftView->setPlainText(rowData.first);
+        setCellWidget(row, 0, leftView);
+
+        rightView = new SqlView();
+        rightView->setFrameStyle(QFrame::NoFrame);
+        rightView->setPlainText(rowData.second);
+        setCellWidget(row, 1, rightView);
+
+        setupHighlighting(rowData.first, rowData.second, leftView, rightView);
+
+        row++;
+    }
+    updateLabels();
+    updateSizes();
+}
+
+void SqlCompareView::setLeftLabel(const QString& label)
+{
+    leftLabel = label;
+}
+
+void SqlCompareView::setRightLabel(const QString& label)
+{
+    rightLabel = label;
+}
+
+void SqlCompareView::updateSizes()
+{
+    if (rowCount() == 0 || !isVisible())
+        return;
+
+    SqlView* view = dynamic_cast<SqlView*>(cellWidget(0, 0));
+    if (!view)
+    {
+        qCritical() << "Not a SqlView in SqlCompareView::updateSizes():" << cellWidget(0, 0);
+        return;
+    }
+
+    QFont font = view->font();
+    QFontMetrics fm(font);
+
+    int leftWidth = horizontalHeader()->sectionSize(0);
+    int rightWidth = horizontalHeader()->sectionSize(1);
+
+    SqlView* leftView = nullptr;
+    SqlView* rightView = nullptr;
+    QSize leftSize;
+    QSize rightSize;
+    for (int row = 0, total = rowCount(); row < total; ++row)
+    {
+        leftView = dynamic_cast<SqlView*>(cellWidget(row, 0));
+        leftView->document()->setTextWidth(leftWidth);
+
+        rightView = dynamic_cast<SqlView*>(cellWidget(row, 1));
+        rightView->document()->setTextWidth(rightWidth);
+
+        leftSize = QSize(leftWidth, leftView->document()->size().toSize().height());
+        rightSize = QSize(rightWidth, rightView->document()->size().toSize().height());
+        if (leftSize.height() > rightSize.height())
+            rightSize.setHeight(leftSize.height());
+        else
+            leftSize.setHeight(rightSize.height());
+
+        leftView->setFixedSize(leftSize);
+        rightView->setFixedSize(rightSize);
+    }
+    verticalHeader()->resizeSections(QHeaderView::ResizeToContents);
+}
+
+void SqlCompareView::updateLabels()
+{
+    setHorizontalHeaderLabels({leftLabel, rightLabel});
+}
+
+void SqlCompareView::setupHighlighting(const QString& left, const QString& right, SqlView* leftView, SqlView* rightView)
+{
+    QList<Diff> diffs = diff->diff_main(left, right);
+    int leftPos = 0;
+    int rightPos = 0;
+    int lgt = 0;
+    for (const Diff& d : diffs)
+    {
+        lgt = d.text.length();
+        switch (d.operation)
+        {
+            case DELETE:
+                leftView->setTextBackgroundColor(leftPos, leftPos + lgt - 1, Qt::red);
+                leftPos += lgt;
+                break;
+            case EQUAL:
+                leftPos += lgt;
+                rightPos += lgt;
+                break;
+            case INSERT:
+                rightView->setTextBackgroundColor(leftPos, leftPos + lgt - 1, Qt::green);
+                rightPos += lgt;
+                break;
+        }
+    }
+}
+
+void SqlCompareView::resizeEvent(QResizeEvent* e)
+{
+    QTableWidget::resizeEvent(e);
+    updateSizes();
+}
+
+void SqlCompareView::showEvent(QShowEvent* e)
+{
+    QTableWidget::showEvent(e);
+    updateSizes();
+}