Add support of extcmdline

FIXME Below description is not accurate anymore

Adds a basic implementation of the external Neovim commandline. Utilizes basic
Qt Widgets (QLineEdit, QTextEdit) to display a floating command prompt.

src/gui/CMakeLists.txt

@@ -33,6 +33,7 @@ else()
 		)
 endif()
 
+add_subdirectory(cmdline)
 add_subdirectory(shellwidget)
 
 include(GNUInstallDirs)
@@ -50,7 +51,7 @@ add_library(neovim-qt-gui
 	treeview.cpp
 	${SRCS_PLATFORM}
 	${NEOVIM_RCC_SOURCES})
-target_link_libraries(neovim-qt-gui ${QTLIBS} qshellwidget neovim-qt)
+target_link_libraries(neovim-qt-gui ${QTLIBS} extcmdline qshellwidget neovim-qt)
 
 if(APPLE)
 	set_property(SOURCE app.cpp PROPERTY COMPILE_DEFINITIONS

src/gui/cmdline/CMakeLists.txt

@@ -0,0 +1,22 @@
+project(qcommandline)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+find_package(Qt5Widgets REQUIRED)
+
+
+if (WIN32 AND USE_STATIC_QT)
+	add_definitions(-DUSE_STATIC_QT)
+endif ()
+
+set(SOURCES
+  blockdisplay.cpp
+  extcmdlinewidget.cpp
+  linemodel.cpp
+  position.cpp
+  )
+
+add_library(extcmdline STATIC ${SOURCES})
+target_link_libraries(extcmdline Qt5::Widgets Qt5::Network)
+target_include_directories(extcmdline PUBLIC ../shellwidget)
+

src/gui/cmdline/blockdisplay.cpp

@@ -0,0 +1,38 @@
+#include "blockdisplay.h"
+
+#include <QList>
+#include <QDebug>
+#include <QStringList>
+
+namespace NeovimQt { namespace Cmdline {
+
+BlockDisplay::BlockDisplay()
+{
+	setVisible(false);
+	setVerticalScrollBarPolicy(Qt::ScrollBarPolicy::ScrollBarAsNeeded);
+	setHorizontalScrollBarPolicy(Qt::ScrollBarPolicy::ScrollBarAlwaysOff);
+	setReadOnly(true);
+	setFocusPolicy(Qt::NoFocus);
+}
+
+QSize BlockDisplay::sizeHint() const
+{
+	QSize parentSizeHint = Super::sizeHint();
+	int padding = contentsMargins().top() + contentsMargins().bottom();
+	parentSizeHint.setHeight(document()->size().height() + padding);
+	return parentSizeHint;
+}
+
+int BlockDisplay::GetMaxLineLength() const
+{
+	QStringList allLines = toPlainText().split('\n');
+
+	int maxChars = 0;
+	for (const auto& line : allLines) {
+		maxChars = qMax(line.size(), maxChars);
+	}
+
+	return maxChars;
+}
+
+} } // namespace NeovimQt::Cmdline

src/gui/cmdline/blockdisplay.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <QTextEdit>
+
+namespace NeovimQt { namespace Cmdline {
+
+class BlockDisplay : public QTextEdit {
+	using Super = QTextEdit;
+
+public:
+	BlockDisplay();
+
+	virtual QSize sizeHint() const override;
+	virtual int GetMaxLineLength() const;
+};
+
+} } // namespace NeovimQt::Cmdline