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| -rw-r--r-- | include/vcl/wizardmachine.hxx | 356 |
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diff --git a/include/vcl/wizardmachine.hxx b/include/vcl/wizardmachine.hxx new file mode 100644 index 000000000..a2ce93663 --- /dev/null +++ b/include/vcl/wizardmachine.hxx @@ -0,0 +1,356 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ +#ifndef INCLUDED_VCL_WIZARDMACHINE_HXX +#define INCLUDED_VCL_WIZARDMACHINE_HXX + +#include <memory> +#include <vcl/dllapi.h> +#include <vcl/builderpage.hxx> + +namespace weld { + class Builder; + class Container; +} + +struct WizPageData; +struct ImplWizButtonData; + +// wizard states +#define WZS_INVALID_STATE (::vcl::WizardTypes::WizardState(-1)) + +namespace vcl +{ + //= WizardTypes + namespace WizardTypes + { + typedef sal_Int16 WizardState; + enum CommitPageReason + { + eTravelForward, // traveling forward (maybe with skipping pages) + eTravelBackward, // traveling backward (maybe with skipping pages) + eFinish, // the wizard is about to be finished + eValidate // the data should be validated only, no traveling will happen + }; + }; + + class SAL_NO_VTABLE IWizardPageController + { + public: + + // This methods behave somewhat different than ActivatePage/DeactivatePage + // The latter are handled by the base class itself whenever changing the pages is in the offing, + // i.e., when it's already decided which page is the next. + // We may have situations where the next page depends on the state of the current, which needs + // to be committed for this. + // So initializePage and commitPage are designated to initializing/committing data on the page. + virtual void initializePage() = 0; + virtual bool commitPage( WizardTypes::CommitPageReason _eReason ) = 0; + + /** determines whether or not it is allowed to advance to a next page + + You should make this dependent on the current state of the page only, not on + states on other pages of the whole dialog. + + The default implementation always returns <TRUE/>. + */ + virtual bool canAdvance() const = 0; + + protected: + ~IWizardPageController() {} + }; + + //= OWizardPage + class VCL_DLLPUBLIC OWizardPage : public BuilderPage, public IWizardPageController + { + public: + OWizardPage(weld::Container* pPage, weld::DialogController* pController, const OUString& rUIXMLDescription, const OString& rID); + virtual ~OWizardPage() override; + + // IWizardPageController overridables + virtual void initializePage() override; + virtual bool commitPage( WizardTypes::CommitPageReason _eReason ) override; + virtual bool canAdvance() const override; + + protected: + // BuilderPage overridables + virtual void Activate() override; + + /** updates the travel-related UI elements of the OWizardMachine we live in (if any) + + If the parent of the tab page is an OWizardMachine, then updateTravelUI at this instance + is called. Otherwise, nothing happens. + */ + void updateDialogTravelUI(); + }; + + //= OWizardMachine + struct WizardMachineImplData; + /** implements some kind of finite automata, where the states of the automata exactly correlate + with tab pages. + + That is, the machine can have up to n states, where at each point in time exactly one state is + the current one. A state being current is represented as one of n tab pages being displayed + currently. + + The class handles the UI for traveling between the states (e.g. it administrates the <em>Next</em> and + <em>Previous</em> buttons which you usually find in a wizard. + + Derived classes have to implement the travel logic by overriding <member>determineNextState</member>, + which has to determine the state which follows the current state. Since this may depend + on the actual data presented in the wizard (e.g. checkboxes checked, or something like this), + they can implement non-linear traveling this way. + */ + class VCL_DLLPUBLIC WizardMachine : public weld::AssistantController + { + protected: + BuilderPage* m_pCurTabPage; + private: + WizardTypes::WizardState m_nCurState; + WizPageData* m_pFirstPage; + + protected: + std::unique_ptr<weld::Button> m_xFinish; + std::unique_ptr<weld::Button> m_xCancel; + std::unique_ptr<weld::Button> m_xNextPage; + std::unique_ptr<weld::Button> m_xPrevPage; + std::unique_ptr<weld::Button> m_xHelp; + + private: + // hold members in this structure to allow keeping compatible when members are added + std::unique_ptr<WizardMachineImplData> m_pImpl; + + public: + WizardMachine(weld::Window* _pParent, WizardButtonFlags _nButtonFlags ); + virtual ~WizardMachine() override; + + bool Finish(short nResult = RET_CANCEL); + bool ShowPage(WizardTypes::WizardState nState); + + bool ShowNextPage(); + bool ShowPrevPage(); + + void AddPage( std::unique_ptr<BuilderPage> xPage ); + void RemovePage( const BuilderPage* pPage ); + void SetPage( WizardTypes::WizardState nLevel, std::unique_ptr<BuilderPage> xPage ); + BuilderPage* GetPage( WizardTypes::WizardState eState ) const; + + /// enable (or disable) buttons + void enableButtons(WizardButtonFlags _nWizardButtonFlags, bool _bEnable); + /// set the default style for a button + void defaultButton(WizardButtonFlags _nWizardButtonFlags); + /// set the default style for a button + void defaultButton(weld::Button* _pNewDefButton); + + /// set the base of the title to use - the title of the current page is appended + void setTitleBase(const OUString& _rTitleBase); + + /// determines whether there is a next state to which we can advance + virtual bool canAdvance() const; + + /** updates the user interface which deals with traveling in the wizard + + The default implementation simply checks whether both the current page and the wizard + itself allow to advance to the next state (<code>canAdvance</code>), and enables the "Next" + button if and only if this is the case. + */ + virtual void updateTravelUI(); + + protected: + virtual void ActivatePage(); + virtual bool DeactivatePage(); + + // our own overridables + + /// to override to create new pages + virtual std::unique_ptr<BuilderPage> createPage(WizardTypes::WizardState _nState) = 0; + + /// will be called when a new page is about to be displayed + virtual void enterState(WizardTypes::WizardState _nState); + + /** will be called when the current state is about to be left for the given reason + + The base implementation in this class will simply call <member>OWizardPage::commitPage</member> + for the current page, and return whatever this call returns. + + @param _eReason + The reason why the state is to be left. + @return + <TRUE/> if and only if the page is allowed to be left + */ + virtual bool prepareLeaveCurrentState( WizardTypes::CommitPageReason eReason ); + + /** will be called when the given state is left + + This is the very last possibility for derived classes to veto the deactivation + of a page. + + @todo Normally, we would not need the return value here - derived classes now have + the possibility to veto page deactivations in <member>prepareLeaveCurrentState</member>. However, + changing this return type is too incompatible at the moment ... + + @return + <TRUE/> if and only if the page is allowed to be left + */ + virtual bool leaveState(WizardTypes::WizardState nState); + + /** determine the next state to travel from the given one + + The default behaviour is linear traveling, overwrite this to change it + + Return WZS_INVALID_STATE to prevent traveling. + */ + virtual WizardTypes::WizardState determineNextState(WizardTypes::WizardState nCurrentState) const; + + /** called when the finish button is pressed + <p>By default, only the base class' Finish method (which is not virtual) is called</p> + */ + virtual bool onFinish(); + + /// travel to the next state + bool travelNext(); + + /// travel to the previous state + bool travelPrevious(); + + /** enables the automatic enabled/disabled state of the "Next" button + + If this is <TRUE/>, then upon entering a new state, the "Next" button will automatically be + enabled if and only if determineNextState does not return WZS_INVALID_STATE. + */ + void enableAutomaticNextButtonState(); + bool isAutomaticNextButtonStateEnabled() const; + + /** removes a page from the history. Should be called when the page is being disabled + */ + void removePageFromHistory(WizardTypes::WizardState nToRemove); + + /** skip a state + + The method behaves as if from the current state, <arg>_nSteps</arg> <method>travelNext</method>s were + called, but without actually creating or displaying the \EDntermediate pages. Only the + (<arg>_nSteps</arg> + 1)th page is created. + + The skipped states appear in the state history, so <method>travelPrevious</method> will make use of them. + + A very essential precondition for using this method is that your <method>determineNextState</method> + method is able to determine the next state without actually having the page of the current state. + + @see skipUntil + @see skipBackwardUntil + */ + void skip(); + + /** skips one or more states, until a given state is reached + + The method behaves as if from the current state, <method>travelNext</method>s were called + successively, until <arg>_nTargetState</arg> is reached, but without actually creating or + displaying the \EDntermediate pages. + + The skipped states appear in the state history, so <method>travelPrevious</method> will make use of them. + + @return + <TRUE/> if and only if traveling was successful + + @see skip + @see skipBackwardUntil + */ + bool skipUntil(WizardTypes::WizardState nTargetState); + + /** moves back one or more states, until a given state is reached + + This method allows traveling backwards more than one state without actually showing the intermediate + states. + + For instance, if you want to travel two steps backward at a time, you could used + two travelPrevious calls, but this would <em>show</em> both pages, which is not necessary, + since you're interested in the target page only. Using <member>skipBackwardUntil</member> relieves + you of this. + + @return + <TRUE/> if and only if traveling was successful + + @see skipUntil + @see skip + */ + bool skipBackwardUntil(WizardTypes::WizardState nTargetState); + + /** returns the current state of the machine + + Vulgo, this is the identifier of the current tab page :) + */ + WizardTypes::WizardState getCurrentState() const { return m_nCurState; } + + virtual IWizardPageController* getPageController(BuilderPage* pCurrentPage) const; + + /** retrieves a copy of the state history, i.e. all states we already visited + */ + void getStateHistory(std::vector<WizardTypes::WizardState>& out_rHistory); + + public: + class AccessGuard + { + friend class WizardTravelSuspension; + private: + AccessGuard() { } + }; + + void suspendTraveling( AccessGuard ); + void resumeTraveling( AccessGuard ); + bool isTravelingSuspended() const; + + protected: + BuilderPage* GetOrCreatePage(const WizardTypes::WizardState i_nState); + + private: + DECL_DLLPRIVATE_LINK(OnNextPage, weld::Button&, void); + DECL_DLLPRIVATE_LINK(OnPrevPage, weld::Button&, void); + DECL_DLLPRIVATE_LINK(OnFinish, weld::Button&, void); + DECL_DLLPRIVATE_LINK(OnCancel, weld::Button&, void); + + VCL_DLLPRIVATE void implUpdateTitle(); + VCL_DLLPRIVATE void implConstruct( const WizardButtonFlags _nButtonFlags ); + }; + + + /// helper class to temporarily suspend any traveling in the wizard + class WizardTravelSuspension + { + public: + WizardTravelSuspension(WizardMachine& rWizard) + : m_pWizard(&rWizard) + { + m_pWizard->suspendTraveling(WizardMachine::AccessGuard()); + } + + ~WizardTravelSuspension() + { + m_pWizard->resumeTraveling(WizardMachine::AccessGuard()); + } + + private: + WizardMachine* m_pWizard; + }; +} // namespace vcl + +#define WIZARDDIALOG_BUTTON_STDOFFSET_X 6 +#define WIZARDDIALOG_BUTTON_SMALLSTDOFFSET_X 3 + +#endif // INCLUDED_VCL_WIZARDMACHINE_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |