1 files changed, 118 insertions, 0 deletions
diff --git a/SQLiteStudio3/guiSQLiteStudio/common/extlineedit.cpp b/SQLiteStudio3/guiSQLiteStudio/common/extlineedit.cpp
new file mode 100644
index 0000000..bd0bffa
--- /dev/null
+++ b/SQLiteStudio3/guiSQLiteStudio/common/extlineedit.cpp
@@ -0,0 +1,118 @@
+#include "extlineedit.h"
+#include "iconmanager.h"
+#include <QStyle>
+#include <QAction>
+#include <QDebug>
+
+ExtLineEdit::ExtLineEdit(QWidget* parent)
+    : QLineEdit(parent)
+{
+    init();
+}
+
+ExtLineEdit::ExtLineEdit(const QString& text, QWidget *parent)
+    : QLineEdit(text, parent)
+{
+    init();
+}
+
+void ExtLineEdit::init()
+{
+    connect(this, &QLineEdit::textChanged, this, &ExtLineEdit::handleTextChanged);
+}
+
+void ExtLineEdit::updateMinSize()
+{
+    setMinimumSize(expandingMinWidth, 0);
+}
+
+int ExtLineEdit::getExpandingMaxWidth() const
+{
+    return expandingMaxWidth;
+}
+
+void ExtLineEdit::setExpandingMaxWidth(int value)
+{
+    expandingMaxWidth = value;
+    setMaximumWidth(value);
+}
+
+void ExtLineEdit::setClearButtonEnabled(bool enable)
+{
+    QLineEdit::setClearButtonEnabled(enable);
+    if (enable)
+    {
+        // This is a hack to get to know when QLineEdit's clear button is pressed.
+        // Unfortunately Qt 5.2 API doesn't provide such information,
+        // but we can find QAction responsible for it by its object name
+        // and handle its triggered() signal.
+        // This is not part of an official Qt's API and may be modified in any Qt version.
+        // Ugly, but works.
+        static const char* qtClearBtnActionName = "_q_qlineeditclearaction";
+        QAction *clearAction = findChild<QAction*>(qtClearBtnActionName);
+        if (!clearAction)
+        {
+            qWarning() << "Could not find 'clear action' in QLineEdit, so 'valueErased()' signal won't be emitted from ExtLineEdit.";
+            return;
+        }
+        connect(clearAction, SIGNAL(triggered()), this, SIGNAL(valueErased()));
+    }
+}
+
+
+bool ExtLineEdit::getExpanding() const
+{
+    return expanding;
+}
+
+void ExtLineEdit::setExpanding(bool value)
+{
+    expanding = value;
+    if (!expanding)
+        setFixedWidth(-1);
+    else
+        setFixedWidth(expandingMinWidth);
+}
+
+int ExtLineEdit::getExpandingMinWidth() const
+{
+    return expandingMinWidth;
+}
+
+void ExtLineEdit::setExpandingMinWidth(int value)
+{
+    expandingMinWidth = value;
+    updateMinSize();
+}
+
+void ExtLineEdit::handleTextChanged()
+{
+    QString txt = text();
+    if (!expanding)
+        return;
+
+    // Text width
+    int newWidth = fontMetrics().width(txt);
+
+    // Text margins
+    QMargins margins = textMargins();
+    newWidth += margins.left() + margins.right();
+
+    // Content margins
+    QMargins localContentsMargins = contentsMargins();
+    newWidth += localContentsMargins.left() + localContentsMargins.right();
+
+    // Frame
+    int frameWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
+    newWidth += frameWidth * 2;
+
+    // Extra space
+    newWidth += expandingExtraSpace;
+
+    if (newWidth < expandingMinWidth)
+        newWidth = expandingMinWidth;
+    else if (expandingMaxWidth > 0 && newWidth > expandingMaxWidth)
+        newWidth = expandingMaxWidth;
+
+    setFixedWidth(newWidth);
+}