Fix KviTopicWidget label shifted down and clipped

KviThemedLabel has margin set to 4. While sizing topic widget this is not
taken into account. This causes rendered topic label text to be shifted down and
clipped at the bottom.

Fix this by setting KviThemedLabel margin to zero.

While at it, simplify management of editor widget lifecycle and widget size.
Instead of doing that by hand on events, create QStackedWidget to operate
visibility and size of label and editing widgets. Create all objects at once in
KviTopicWidget constructor, attach label widget at index 0 and a KViTaiHbox
with line editor and 3 buttons at index 1. Only operate visibility by switching
current stacked widget index and let QStackedWidget resize it's contents as
needed.

src/kvirc/ui/KviChannelWindow.cpp

@@ -99,6 +99,7 @@ KviChannelWindow::KviChannelWindow(KviConsoleWindow * lpConsole, const QString &
 	m_pButtonContainer->setContentsMargins(0, 0, 0, 0);
 	// Topic widget on the left
 	m_pTopicWidget = new KviTopicWidget(m_pTopSplitter, this, "topic_widget");
+	m_pTopSplitter->setStretchFactor(0, 1);
 
 	connect(m_pTopicWidget, SIGNAL(topicSelected(const QString &)),
 	    this, SLOT(topicSelected(const QString &)));

src/kvirc/ui/KviInputEditor.cpp

@@ -139,6 +139,11 @@ class KviInputEditorPrivate
 };
 
 KviInputEditor::KviInputEditor(QWidget * pPar, KviWindow * pWnd, KviUserListView * pView)
+    : KviInputEditor(pPar, pPar, pWnd, pView)
+{
+}
+
+KviInputEditor::KviInputEditor(QWidget * pPar, QWidget * pInputParent, KviWindow * pWnd, KviUserListView * pView)
     : QWidget(pPar)
 {
 	m_p = new KviInputEditorPrivate();
@@ -150,7 +155,7 @@ KviInputEditor::KviInputEditor(QWidget * pPar, KviWindow * pWnd, KviUserListView
 	setObjectName("input_widget");
 
 	m_pIconMenu = nullptr;
-	m_pInputParent = pPar;
+	m_pInputParent = pInputParent;
 	m_iMaxBufferSize = KVI_INPUT_MAX_BUFFER_SIZE;
 	m_iCursorPosition = 0;       //Index of the char AFTER the cursor
 	m_iSpellCheckPosition = 0;   //Index of the char where spell checking is occuring

src/kvirc/ui/KviInputEditor.h

@@ -101,6 +101,7 @@ class KVIRC_API KviInputEditor : public QWidget
 	* \return KviInputEditor
 	*/
 	KviInputEditor(QWidget * pPar, KviWindow * pWnd, KviUserListView * pView = nullptr);
+	KviInputEditor(QWidget * pPar, QWidget * pInputParent, KviWindow * pWnd, KviUserListView * pView = nullptr);
 
 	/**
 	* \brief Destroys the Input editor object

src/kvirc/ui/KviThemedLabel.cpp

@@ -45,7 +45,7 @@ KviThemedLabel::KviThemedLabel(QWidget * par, KviWindow * pWindow, const char *
 {
 	setObjectName(name);
 	m_pKviWindow = pWindow;
-	setMargin(4);
+	setMargin(0);
 	setAutoFillBackground(false);
 	applyOptions();
 }

src/kvirc/ui/KviTopicWidget.cpp

@@ -38,6 +38,7 @@
 #include "KviIrcConnectionServerInfo.h"
 #include "KviIrcConnectionUserInfo.h"
 #include "KviHtmlGenerator.h"
+#include "KviTalHBox.h"
 #include "KviTalToolTip.h"
 #include "KviThemedLabel.h"
 
@@ -49,6 +50,7 @@
 #include <QMouseEvent>
 #include <QPainter>
 #include <QPushButton>
+#include <QStackedWidget>
 
 extern KviColorWindow * g_pColorWindow;
 
@@ -100,17 +102,57 @@ KviTopicWidget::KviTopicWidget(QWidget * par, KviChannelWindow * pChannel, const
 {
 	setObjectName(name);
 	m_pKviChannelWindow = pChannel;
-	m_pHistory = nullptr;
-	m_pAccept = nullptr;
-	m_pDiscard = nullptr;
 	m_pContextPopup = nullptr;
 	m_iCursorPosition = 0;
-	m_pInput = nullptr;
 
+	// Topic label widget
 	m_pLabel = new KviThemedLabel(this, pChannel, "topic_label");
 	m_pLabel->setTextFormat(Qt::RichText);
 	connect(m_pLabel, SIGNAL(doubleClicked()), this, SLOT(switchMode()));
 
+	m_pInputBox = new KviTalHBox(this);
+
+	// Topic editor input widget
+	m_pInput = new KviInputEditor(m_pInputBox, this, m_pKviChannelWindow);
+	m_pInputBox->setStretchFactor(m_pInput, 1); // allow it to fill all available space excluding history, accept and discard buttons
+	m_pInput->setReadOnly(true);
+	m_pInput->setObjectName("topicw_inputeditor");
+	connect(m_pInput, SIGNAL(enterPressed()), this, SLOT(acceptClicked()));
+	connect(m_pInput, SIGNAL(escapePressed()), this, SLOT(discardClicked()));
+	m_pInput->installEventFilter(this);
+
+
+	m_pHistory = new QPushButton(m_pInputBox);
+	m_pHistory->setObjectName("topicw_historybutton");
+	m_pHistory->setIcon(QIcon(*(g_pIconManager->getSmallIcon(KviIconManager::History))));
+	m_pHistory->setGeometry(width() - (height() << 2) + height(), 0, height(), height());
+	KviTalToolTip::add(m_pHistory, __tr2qs("History"));
+	connect(m_pHistory, SIGNAL(clicked()), this, SLOT(historyClicked()));
+
+	m_pAccept = new QPushButton(m_pInputBox);
+	m_pAccept->setObjectName("topicw_acceptbutton");
+	m_pAccept->setIcon(QIcon(*(g_pIconManager->getSmallIcon(KviIconManager::Accept))));
+	m_pAccept->setGeometry(width() - (height() << 1), 0, height(), height());
+	m_pAccept->setEnabled(false);
+	KviTalToolTip::add(m_pAccept, __tr2qs("Commit changes"));
+	connect(m_pAccept, SIGNAL(clicked()), this, SLOT(acceptClicked()));
+
+	m_pDiscard = new QPushButton(m_pInputBox);
+	m_pDiscard->setObjectName("topicw_discardbutton");
+	m_pDiscard->setIcon(QIcon(*(g_pIconManager->getSmallIcon(KviIconManager::Discard))));
+	m_pDiscard->setGeometry(width() - height(), 0, height(), height());
+	KviTalToolTip::add(m_pDiscard, __tr2qs("Discard changes"));
+	connect(m_pDiscard, SIGNAL(clicked()), this, SLOT(discardClicked()));
+
+	// Stack topic label and input box widgets
+	m_pLabelAndInputBoxStack = new QStackedWidget(this);
+
+	m_pLabelAndInputBoxStack->addWidget(m_pLabel);
+	m_pLabelAndInputBoxStack->addWidget(m_pInputBox);
+
+	// Start showing topic label widget
+	m_pLabelAndInputBoxStack->setCurrentIndex(0);
+
 	reset();
 
 	m_pCompletionBox = new KviTalListWidget(this, "topic_completion_box", Qt::Popup);
@@ -473,49 +515,18 @@ void KviTopicWidget::switchMode()
 		}
 		w = w->parent();
 	}
-	if(m_pInput == nullptr)
+	if(m_pLabelAndInputBoxStack->currentIndex() == 0)
 	{
-		m_pInput = new KviInputEditor(this, m_pKviChannelWindow);
-		m_pInput->setObjectName("topicw_inputeditor");
 		m_pInput->setReadOnly(!bCanEdit);
 		if(iMaxLen > 0)
 			m_pInput->setMaxBufferSize(iMaxLen);
-		m_pInput->setGeometry(0, 0, width() - (height() << 2) + height(), height());
 		m_pInput->setText(m_szTopic);
-		connect(m_pInput, SIGNAL(enterPressed()), this, SLOT(acceptClicked()));
-		connect(m_pInput, SIGNAL(escapePressed()), this, SLOT(discardClicked()));
-		m_pInput->installEventFilter(this);
-
-		m_pHistory = new QPushButton(this);
-		m_pHistory->setObjectName("topicw_historybutton");
-		m_pHistory->setIcon(QIcon(*(g_pIconManager->getSmallIcon(KviIconManager::History))));
-		m_pHistory->setGeometry(width() - (height() << 2) + height(), 0, height(), height());
-		KviTalToolTip::add(m_pHistory, __tr2qs("History"));
-		m_pHistory->show();
-		connect(m_pHistory, SIGNAL(clicked()), this, SLOT(historyClicked()));
-
-		m_pAccept = new QPushButton(this);
-		m_pAccept->setObjectName("topicw_acceptbutton");
-		m_pAccept->setIcon(QIcon(*(g_pIconManager->getSmallIcon(KviIconManager::Accept))));
-		m_pAccept->setGeometry(width() - (height() << 1), 0, height(), height());
 		m_pAccept->setEnabled(bCanEdit);
-		m_pAccept->show();
-		KviTalToolTip::add(m_pAccept, __tr2qs("Commit changes"));
-		connect(m_pAccept, SIGNAL(clicked()), this, SLOT(acceptClicked()));
-
-		m_pDiscard = new QPushButton(this);
-		m_pDiscard->setObjectName("topicw_discardbutton");
-		m_pDiscard->setIcon(QIcon(*(g_pIconManager->getSmallIcon(KviIconManager::Discard))));
-		m_pDiscard->setGeometry(width() - height(), 0, height(), height());
-		KviTalToolTip::add(m_pDiscard, __tr2qs("Discard changes"));
-		m_pDiscard->show();
-		connect(m_pDiscard, SIGNAL(clicked()), this, SLOT(discardClicked()));
+
+		m_pLabelAndInputBoxStack->setCurrentIndex(1);
 
 		m_pInput->home();
-		m_pInput->show();
 		m_pInput->setFocus();
-
-		m_pLabel->hide();
 	}
 	else
 	{
@@ -621,37 +632,18 @@ void KviTopicWidget::keyPressEvent(QKeyEvent * e)
 
 void KviTopicWidget::resizeEvent(QResizeEvent *)
 {
-	if(m_pInput)
-	{
-		m_pInput->setGeometry(0, 0, width() - (height() << 2) + height(), height());
-		m_pHistory->setGeometry(width() - (height() << 2) + height(), 0, height(), height());
-		m_pAccept->setGeometry(width() - (height() << 1), 0, height(), height());
-		m_pDiscard->setGeometry(width() - height(), 0, height(), height());
-	}
-	else
-	{
-		m_pLabel->setGeometry(0, 0, width(), height());
-	}
+	m_pLabelAndInputBoxStack->setGeometry(0, 0, width(), height());
 }
 
 void KviTopicWidget::deactivate()
 {
 	popDownListBox();
-	if(m_pInput)
+	if(m_pLabelAndInputBoxStack->currentIndex() != 0)
 	{
-		m_pInput->deleteLater();
-		m_pInput = nullptr;
-		m_pHistory->deleteLater();
-		m_pHistory = nullptr;
-		m_pAccept->deleteLater();
-		m_pAccept = nullptr;
-		m_pDiscard->deleteLater();
-		m_pDiscard = nullptr;
+		m_pAccept->setEnabled(false);
+		m_pLabelAndInputBoxStack->setCurrentIndex(0);
 	}
 
-	m_pLabel->show();
-	resizeEvent(nullptr);
-
 	if(g_pColorWindow && g_pColorWindow->isVisible())
 		g_pColorWindow->hide();
 

src/kvirc/ui/KviTopicWidget.h

@@ -36,9 +36,11 @@
 class KviChannelWindow;
 class KviIrcConnection;
 class KviThemedLabel;
+class KviTalHBox;
 class QComboBox;
 class QMenu;
 class QPushButton;
+class QStackedWidget;
 
 class KVIRC_API KviTopicListBoxItemDelegate : public KviTalIconAndRichTextItemDelegate
 {
@@ -83,6 +85,8 @@ class KVIRC_API KviTopicWidget : public QWidget
 	QMenu * m_pContextPopup;
 	QAbstractItemDelegate * m_pItemDelegate;
 	KviThemedLabel * m_pLabel;
+	KviTalHBox * m_pInputBox;
+	QStackedWidget * m_pLabelAndInputBoxStack;
 	KviInputEditor * m_pInput;
 	KviTalListWidget * m_pCompletionBox;
 	KviChannelWindow * m_pKviChannelWindow;