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Simplify ToggleActionMenu

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* Remove the ImplicitDefaultAction intelligence, so ToggleActionMenu is
  not more than a KActionMenu with setDefaultAction().
* Instead, reset the default action when it gets removed from the menu().
  This is done by filtering QActionEvent from menu().
* Add an autotest for ToggleActionMenu.

This replaces prior efforts to fix problems in ToggleActionMenu
in !245 and !254, following the discussion on the virtual meeting
at 2021-02-26.

6b26a2b4b and 1786e6c99 have already ported PageView and
AnnotationActionHandler to the simplified interface.
This commit is contained in:
David Hurka 2021-04-23 01:54:42 +00:00 committed by Albert Astals Cid
parent 394001017e
commit 5a58d3bb8e
4 changed files with 183 additions and 140 deletions
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5
autotests/CMakeLists.txt
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@ -133,3 +133,8 @@ if(Discount_FOUND)
LINK_LIBRARIES Qt5::Test okularcore KF5::I18n PkgConfig::Discount
)
endif()
ecm_add_test(toggleactionmenutest.cpp ../part/toggleactionmenu.cpp
TEST_NAME "toggleactionmenutest"
LINK_LIBRARIES Qt5::Test KF5::WidgetsAddons
)

88
autotests/toggleactionmenutest.cpp Normal file
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@ -0,0 +1,88 @@
/***************************************************************************
* Copyright (C) 2020 David Hurka <david.hurka@mailbox.org> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
***************************************************************************/
#include <QtTest>
#include "../part/toggleactionmenu.h"
#include <QToolBar>
class ToggleActionMenuTest : public QObject
{
Q_OBJECT
private Q_SLOTS:
void testSetDefaultAction();
void testDeleteToolBarButton();
};
void ToggleActionMenuTest::testSetDefaultAction()
{
QToolBar dummyToolBar;
ToggleActionMenu menu(QStringLiteral("Menu"), this);
QAction *actionA = new QAction(QStringLiteral("A"), this);
QAction *actionB = new QAction(QStringLiteral("B"), this);
// Do not set a default action, the menu should behave as plain KActionMenu.
QCOMPARE(menu.defaultAction(), &menu);
QToolButton *menuButton = qobject_cast<QToolButton *>(menu.createWidget(&dummyToolBar));
QVERIFY(menuButton);
QCOMPARE(menuButton->defaultAction(), &menu);
// Should still behave as plain KActionMenu when actions are added.
menu.addAction(actionA);
QCOMPARE(menu.defaultAction(), &menu);
QCOMPARE(menuButton->defaultAction(), &menu);
// Set an action from the menu as default action, should work.
menu.setDefaultAction(actionA);
QCOMPARE(menu.defaultAction(), actionA);
QCOMPARE(menuButton->defaultAction(), actionA);
// Set a foreign action as default action, should reset the default action.
menu.setDefaultAction(actionB);
QCOMPARE(menu.defaultAction(), &menu);
QCOMPARE(menuButton->defaultAction(), &menu);
// Set an action of the menu as default action, should work.
menu.setDefaultAction(actionA);
QCOMPARE(menu.defaultAction(), actionA);
QCOMPARE(menuButton->defaultAction(), actionA);
// Remove default action from menu, should reset the default action.
menu.removeAction(actionA);
QCOMPARE(menu.defaultAction(), &menu);
QCOMPARE(menuButton->defaultAction(), &menu);
}
void ToggleActionMenuTest::testDeleteToolBarButton()
{
QToolBar dummyToolBar;
ToggleActionMenu menu(QStringLiteral("Menu"), this);
QAction *actionA = new QAction(QStringLiteral("A"), this);
QAction *actionB = new QAction(QStringLiteral("B"), this);
// Setup: set a default action and create two toolbar buttons.
menu.addAction(actionA);
menu.addAction(actionB);
menu.setDefaultAction(actionA);
QToolButton *menuButtonA = qobject_cast<QToolButton *>(menu.createWidget(&dummyToolBar));
QVERIFY(menuButtonA);
QCOMPARE(menuButtonA->defaultAction(), actionA);
QToolButton *menuButtonB = qobject_cast<QToolButton *>(menu.createWidget(&dummyToolBar));
QVERIFY(menuButtonB);
// Delete button B, and set a new default action. Button A shall be updated without segfaulting on the deleted button B.
delete menuButtonB;
menu.setDefaultAction(actionB);
QCOMPARE(menuButtonA->defaultAction(), actionB);
}
QTEST_MAIN(ToggleActionMenuTest)
#include "toggleactionmenutest.moc"

101
part/toggleactionmenu.cpp
View file

@ -1,5 +1,5 @@
/***************************************************************************
* Copyright (C) 2019 by David Hurka <david.hurka@mailbox.org> *
* Copyright (C) 2019-2021 by David Hurka <david.hurka@mailbox.org> *
* *
* Inspired by and replacing toolaction.h by: *
* Copyright (C) 2004-2006 by Albert Astals Cid <aacid@kde.org> *
@ -12,8 +12,8 @@
#include "toggleactionmenu.h"
#include <QActionEvent>
#include <QMenu>
#include <QPointer>
ToggleActionMenu::ToggleActionMenu(QObject *parent)
: ToggleActionMenu(QIcon(), QString(), parent)
@ -25,43 +25,38 @@ ToggleActionMenu::ToggleActionMenu(const QString &text, QObject *parent)
{
}
ToggleActionMenu::ToggleActionMenu(const QIcon &icon, const QString &text, QObject *parent, PopupMode popupMode, MenuLogic logic)
ToggleActionMenu::ToggleActionMenu(const QIcon &icon, const QString &text, QObject *parent)
: KActionMenu(icon, text, parent)
, m_defaultAction(nullptr)
, m_suggestedDefaultAction(nullptr)
, m_menuLogic(logic)
{
connect(this, &QAction::changed, this, &ToggleActionMenu::updateButtons);
if (popupMode == DelayedPopup) {
setDelayed(true);
} else {
setDelayed(false);
}
setStickyMenu(false);
if (logic & ImplicitDefaultAction) {
connect(menu(), &QMenu::triggered, this, &ToggleActionMenu::setDefaultAction);
}
slotMenuChanged();
}
QWidget *ToggleActionMenu::createWidget(QWidget *parent)
{
QToolButton *button = qobject_cast<QToolButton *>(KActionMenu::createWidget(parent));
QWidget *buttonWidget = KActionMenu::createWidget(parent);
QToolButton *button = qobject_cast<QToolButton *>(buttonWidget);
if (!button) {
// This function is used to add a button into the toolbar.
// KActionMenu will plug itself as QToolButton.
// So, if no QToolButton was returned, this was not called the intended way.
return button;
Q_ASSERT_X(false,
"ToggleActionMenu::createWidget()",
"Parent implementation KActionMenu::createWidget() did not return a QToolButton, but ToggleActionMenu is designed for QToolButton. Did you call createWidget() manually, with something else than a QToolBar?");
return buttonWidget;
}
// BEGIN QToolButton hack
// Setting the default action of a QToolButton
// to an action of its menu() is tricky.
// Remove this menu action from the button,
// so it doesn't compose a menu of this menu action and its own menu.
button->removeAction(this);
// The button has lost the menu now, let it use the correct menu.
button->setMenu(menu());
// END QToolButton hack
m_buttons.append(QPointer<QToolButton>(button));
m_buttons.append(button);
// Apply other properties to the button.
updateButtons();
@ -69,46 +64,28 @@ QWidget *ToggleActionMenu::createWidget(QWidget *parent)
return button;
}
QAction *ToggleActionMenu::defaultAction()
{
return m_defaultAction ? m_defaultAction : this;
}
void ToggleActionMenu::setDefaultAction(QAction *action)
{
m_defaultAction = action;
updateButtons();
}
void ToggleActionMenu::suggestDefaultAction(QAction *action)
{
m_suggestedDefaultAction = action;
}
QAction *ToggleActionMenu::checkedAction(QMenu *menu) const
{
// Look at each action a in the menu whether it is checked.
// If a is a menu, recursively call checkedAction().
const QList<QAction *> actions = menu->actions();
for (QAction *a : actions) {
if (a->isChecked()) {
return a;
} else if (a->menu()) {
QAction *b = checkedAction(a->menu());
if (b) {
return b;
}
}
if (action && menu()->actions().contains(action)) {
m_defaultAction = action;
} else {
m_defaultAction = nullptr;
}
return nullptr;
updateButtons();
}
void ToggleActionMenu::updateButtons()
{
for (const QPointer<QToolButton> &button : qAsConst(m_buttons)) {
for (QToolButton *button : qAsConst(m_buttons)) {
if (button) {
button->setDefaultAction(defaultAction());
button->setDefaultAction(this->defaultAction());
// Override some properties of the default action,
// where the property of this menu makes more sense.
button->setEnabled(isEnabled());
if (delayed()) {
if (delayed()) { // TODO deprecated interface.
button->setPopupMode(QToolButton::DelayedPopup);
} else if (stickyMenu()) {
button->setPopupMode(QToolButton::InstantPopup);
@ -119,13 +96,21 @@ void ToggleActionMenu::updateButtons()
}
}
QAction *ToggleActionMenu::defaultAction()
bool ToggleActionMenu::eventFilter(QObject *watched, QEvent *event)
{
if ((m_menuLogic & ImplicitDefaultAction) && !m_defaultAction) {
m_defaultAction = checkedAction(menu());
// If the defaultAction() is removed from the menu, reset the default action.
if (watched == menu() && event->type() == QEvent::ActionRemoved) {
QActionEvent *actionEvent = static_cast<QActionEvent *>(event);
if (actionEvent->action() == defaultAction()) {
setDefaultAction(nullptr);
}
}
if (!m_defaultAction) {
m_defaultAction = m_suggestedDefaultAction;
}
return m_defaultAction;
return KActionMenu::eventFilter(watched, event);
}
void ToggleActionMenu::slotMenuChanged()
{
menu()->installEventFilter(this);
// Not removing old event filter, because we would need to remember the old menu.
}

129
part/toggleactionmenu.h
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@ -1,5 +1,5 @@
/***************************************************************************
* Copyright (C) 2019 by David Hurka <david.hurka@mailbox.org> *
* Copyright (C) 2019-2021 by David Hurka <david.hurka@mailbox.org> *
* *
* Inspired by and replacing toolaction.h by: *
* Copyright (C) 2004-2006 by Albert Astals Cid <aacid@kde.org> *
@ -14,54 +14,36 @@
#define TOGGLEACTIONMENU_H
#include <KActionMenu>
#include <QPointer>
#include <QSet>
#include <QToolButton>
/**
* @brief A KActionMenu, with allows to set the default action of its toolbar buttons.
* @brief A KActionMenu, which allows to set the default action of its toolbar buttons.
*
* Usually, a KActionMenu creates toolbar buttons which reflect its own action properties
* (icon, text, tooltip, checked state,...), as it is a QAction itself.
*
* ToggleActionMenu will use its own action properties only when plugged as submenu in another menu.
* The default action of the toolbar buttons can easily be changed with the slot setDefaultAction().
*
* Naming: The user can *Toggle* the checked state of an *Action* by directly clicking the toolbar button,
* but can also open a *Menu*.
* This behaves like a KActionMenu, with the addition of setDefaultAction().
*
* @par Intention
* Setting the default action of the toolbar button can be useful for:
* * Providing the most probably needed entry of a menu directly on the menu button.
* * Showing the last used menu entry on the menu button, including its checked state.
* The advantage is that the user often does not need to open the menu,
* and that the toolbar button shows additional information
* like checked state or the user's last selection.
* Setting the default action of toolbar buttons has the advantage that the user
* can trigger a frequently used action directly without opening the menu.
* Additionally, the state of the default action is visible in the toolbar.
*
* This shall replace the former ToolAction in Okular,
* while being flexible enough for other (planned) action menus.
* @par Example
* You can make the toolbar button show the last used action with only one connection.
* You may want to initialize the default action.
* \code
* if (myToggleActionMenu->defaultAction() == myToggleActionMenu) {
* myToggleActionMenu->setDefaultAction(myFirstAction);
* }
* connect(myToggleActionMenu->menu(), &QMenu::triggered,
* myToggleActionMenu, &ToggleActionMenu::setDefaultAction);
* \endcode
*/
class ToggleActionMenu : public KActionMenu
{
Q_OBJECT
public:
/**
* Defines how the menu behaves.
*/
enum MenuLogic {
DefaultLogic = 0x0,
/**
* Automatically makes the triggered action the default action, even if in a submenu.
* When a toolbar button is constructed,
* the default action is set to the default action set with setDefaultAction() before,
* otherwise to the first checked action in the menu,
* otherwise to the action suggested with suggestDefaultAction().
*/
ImplicitDefaultAction = 0x1
};
enum PopupMode { DelayedPopup, MenuButtonPopup };
explicit ToggleActionMenu(QObject *parent);
ToggleActionMenu(const QString &text, QObject *parent);
/**
@ -70,78 +52,61 @@ public:
* @param icon The icon of this menu, when plugged into another menu.
* @param text The name of this menu, when plugged into another menu.
* @param parent Parent @c QOject.
* @param popupMode The popup mode of the toolbar buttons.
* You will want to use @c DelayedPopup or @c MenuButtonPopup,
* @c InstantPopup would make @c ToggleActionMenu pointless.
* @param logic To define special behaviour of @c ToggleActionMenu,
* to simplify the usage.
*/
ToggleActionMenu(const QIcon &icon, const QString &text, QObject *parent, PopupMode popupMode = MenuButtonPopup, MenuLogic logic = DefaultLogic);
ToggleActionMenu(const QIcon &icon, const QString &text, QObject *parent);
QWidget *createWidget(QWidget *parent) override;
/**
* Returns the current default action of the toolbar buttons.
* May be @c this.
*
* In ImplicitDefaultAction mode,
* when the default action was not yet set with setDefaultAction(),
* it will determine it from the first checked action in the menu,
* otherwise from the action set with suggestDefaultAction().
* This action is set by setDefaultAction().
*/
QAction *defaultAction();
/**
* Suggests a default action to be used as fallback.
*
* It will be used if the default action is not determined another way.
* This is useful for ImplicitDefaultAction mode,
* when you can not guarantee that one action in the menu
* will be checked.
*
* @note
* In DefaultLogic mode, or when you already have called setDefaultAction(),
* you have to use setDefaultAction() instead.
*/
void suggestDefaultAction(QAction *action);
public slots:
public Q_SLOTS:
/**
* Sets the default action of the toolbar buttons.
*
* This action will be triggered by clicking directly on the toolbar buttons.
* It will also set the text, icon, checked state, etc. of the toolbar buttons.
* Toolbar buttons are updated immediately.
*
* Calling setDefaultAction(nullptr) will reset the default action
* to this menu itself.
*
* @note
* The default action will not set the enabled state or popup mode of the menu buttons.
* These properties are still set by the corresponding properties of this ToggleActionMenu.
* @p action must be present in the menu as direct child action.
* The default action will be reset to this menu itself
* when @p action is removed from the menu.
*
* @warning
* The action will not be added to the menu,
* it usually makes sense to addAction() it before to setDefaultAction() it.
*
* @see suggestDefaultAction()
* @note
* @p action will define all properties of the toolbar buttons.
* When you disable @p action, the toolbar button will become disabled too.
* Then the menu can no longer be accessed.
*/
void setDefaultAction(QAction *action);
private:
QAction *m_defaultAction;
QAction *m_suggestedDefaultAction;
protected:
/** Can store @c nullptr, which means this menu itself will be the default action. */
QPointer<QAction> m_defaultAction;
QList<QPointer<QToolButton>> m_buttons;
MenuLogic m_menuLogic;
/**
* Returns the first checked action in @p menu and its submenus,
* or nullptr if no action is checked.
*/
QAction *checkedAction(QMenu *menu) const;
private slots:
/**
* Updates the toolbar buttons, using both the default action and properties of this menu itself.
* Updates the toolbar buttons by setting the current defaultAction() on them.
*
* This ensures that the toolbar buttons reflect e. g. a disabled state of this menu.
* (If the current defaultAction() is invalid, `this` is used instead.)
*/
void updateButtons();
/**
* Updates the event filter, which listens to QMenu’s QActionEvent.
*
* This is connected to QAction::changed().
* That signal is emmited when the menu changes, but that’s not documented.
*/
void slotMenuChanged();
bool eventFilter(QObject *watched, QEvent *event) override;
};
#endif // TOGGLEACTIONMENU_H