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250 lines
11 KiB
250 lines
11 KiB
/* This file is part of the KDE project
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Copyright (C) 2005-2006 Jaroslaw Staniek <js@iidea.pl>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef KEXIDATAITEMINTERFACE_H
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#define KEXIDATAITEMINTERFACE_H
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#include <tqvariant.h>
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#include <tqwidget.h>
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#include <tqguardedptr.h>
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class KexiDataItemInterface;
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namespace KexiDB {
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class Field;
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class QueryColumnInfo;
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}
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//! An helper class used to react on KexiDataItemInterface objects' changes.
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class KEXICORE_EXPORT KexiDataItemChangesListener
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{
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public:
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KexiDataItemChangesListener();
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virtual ~KexiDataItemChangesListener();
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/*! Implement this to react for change of \a item.
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Called by KexiDataItemInterface::valueChanged() */
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virtual void valueChanged(KexiDataItemInterface* item) = 0;
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/*! Implement this to return information whether we're currently at new row or not.
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This can be used e.g. by data-aware widgets to determine if "(autonumber)"
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label should be displayed. */
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virtual bool cursorAtNewRow() const = 0;
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};
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//! An interface for declaring widgets to be data-aware.
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class KEXICORE_EXPORT KexiDataItemInterface
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{
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public:
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KexiDataItemInterface();
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virtual ~KexiDataItemInterface();
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/*! Just initializes \a value, and calls setValueInternal(const TQString& add, bool removeOld).
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If \a removeOld is true, current value is set up as \a add.
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If \a removeOld if false, current value is set up as \a value + \a add.
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\a value is stored as 'old value' -it'd be usable in the future
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(e.g. Combo Box editor can use old value if current value does not
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match any item on the list).
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\a visibleValue (if not NULL) is passed to provide visible value to display instead of \a value.
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This is currently used only in case of the combo box form widget, where displayed content
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(usually a text of image) differs from the value of the widget (a numeric index).
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This method is called by table view's and form's editors. */
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void setValue(const TQVariant& value, const TQVariant& add = TQVariant(), bool removeOld = false,
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const TQVariant* visibleValue = 0);
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//! \return field information for this item
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virtual KexiDB::Field *field() const = 0;
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//! \return column information for this item
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virtual KexiDB::QueryColumnInfo* columnInfo() const = 0;
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//! Used internally to set column information.
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virtual void setColumnInfo(KexiDB::QueryColumnInfo* cinfo) = 0;
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//! Sets listener. No need to reimplement this.
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virtual void installListener(KexiDataItemChangesListener* listener);
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// //! Sets value \a value for a widget.
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// //! Just calls setValueInternal(), but also blocks valueChanged()
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// //! as you we don't want to react on our own change
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// void setValue(const TQVariant& value);
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//! \return value currently represented by this item.
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virtual TQVariant value() = 0;
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//! \return true if editor's value is valid for a given type
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//! Used for checking if an entered value is valid,
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//! E.g. a part of time value can be entered: "12:8" and this is invalid, not only null.
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//! Null time or date is valid in Kexi, so it is not enough to test value().isValid().
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//! Default implementation just returns true.
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virtual bool valueIsValid();
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//! \return true if editor's value is null (not empty)
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//! Used for checking if a given constraint within table or form is met.
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virtual bool valueIsNull() = 0;
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//! \return true if editor's value is empty (not necessary null).
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//! Only few data types can accept "EMPTY" property
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//! (use KexiDB::Field::hasEmptyProperty() to check this).
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//! Used for checking if a given constraint within table of form is met.
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virtual bool valueIsEmpty() = 0;
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//! \return value that should be displayed for this item.
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//! Only used for items like combo box, where real value is an integer while
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//! displayed value is usually a text. For other item types this method should be empty.
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virtual TQVariant visibleValue() { return TQVariant(); }
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/*! \return 'readOnly' flag for this item. The flag is usually taken from
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the item's widget, e.g. KLineEdit::isReadOnly().
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By default, always returns false. */
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virtual bool isReadOnly() const { return false; }
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/*! \return the view widget of this item, e.g. line edit widget. */
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virtual TQWidget* widget() = 0;
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/*! Hides item's widget, if available. */
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virtual void hideWidget() { if (widget()) widget()->hide(); }
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/*! Shows item's widget, if available. */
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virtual void showWidget() { if (widget()) widget()->show(); }
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//! \return true if editor's value is changed (compared to original value)
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virtual bool valueChanged();
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/*! \return true if the item widget's cursor (whatever that means, eg. line edit cursor)
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is at the beginning of editor's contents. This can inform table/form view that
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after pressing "left arrow" key should stop editing and move to a field on the left hand. */
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virtual bool cursorAtStart() = 0;
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/*! \return true if the item widget's cursor (whatever that means, eg. line edit cursor)
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is at the end of editor's contents. This can inform table/form view that
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after pressing "right arrow" key should stop editing and move to a field on the right hand. */
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virtual bool cursorAtEnd() = 0;
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/*! Moves cursor after the last character (or element).
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For implementation in items supporting text cursor's movement; by default does nothing. */
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virtual void moveCursorToEnd() {};
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/*! Moves cursor before the first character (or element).
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For implementation in items supporting text cursor's movement; by default does nothing. */
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virtual void moveCursorToStart() {};
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/*! Selects all characters (or elements) of the item.
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For implementation in items supporting text or elements; by default does nothing. */
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virtual void selectAll() {};
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//! clears item's data, so the data will contain NULL data
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virtual void clear() = 0;
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/*! \return true if this editor offers a widget (e.g. line edit) that we can move focus to.
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Editor for boolean values has this set to false (see KexiBoolTableEdit).
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This is true by default. You can override this flag by changing
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m_hasFocusableWidget in your subclass' constructor. */
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inline bool hasFocusableWidget() const { return m_hasFocusableWidget; }
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/*! Displays additional elements that are needed for indicating that the current cell
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is selected. For example, combobox editor (KexiComboBoxTableEdit) moves and shows
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dropdown button. \a r is the rectangle for the cell.
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If \a readOnly is true, additional elements should be visually disabled,
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e.g. dropdown button of the combobox editor should be disabled.
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For reimplementation. By default does nothing. */
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virtual void showFocus( const TQRect& r, bool readOnly );
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/*! Hides additional elements that are needed for indicating that the current cell
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is selected.
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For reimplementation. By default does nothing. */
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virtual void hideFocus();
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/*! Allows to define reaction for clicking on cell's contents.
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Currently it's used for editor of type boolean, where we want to toggle true/false
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on single mouse click. \sa hasFocusableWidget(), KexiBoolTableEdit.
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Default implementation does nothing. */
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virtual void clickedOnContents();
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/*! \return true if editing should be accepted immediately after
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deleting contents for the cell (usually using Delete key).
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This flag is false by default, and is true e.g. for date, time and datetime types. */
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bool acceptEditorAfterDeleteContents() const { return m_acceptEditorAfterDeleteContents; }
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inline virtual void setFocus() { if (widget()) widget()->setFocus(); }
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bool cursorAtNewRow();
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/*! Sets a pointer to a Parent Data Item Interface. This pointer is 0 by default,
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but can be set by tqparent widget if this interface is a building block of a larger data widget.
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It is the case for KexiDBFieldEdit widget (see KexiDBFieldEdit::createEditor()). Use with care.
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signalValueChanged() method will check this pointer, and if it's not 0,
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m_parentDataItemInterface->signalValueChanged() is called, so a changes can be signalled at higher level. */
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void setParentDataItemInterface(KexiDataItemInterface* parentDataItemInterface);
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/*! \return a pointer to a Parent Data Item Interface.
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@see setParentDataItemInterface() */
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inline KexiDataItemInterface* parentInterface() const { return m_parentDataItemInterface; }
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/*! Handles action having standard name \a actionName.
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Action could be: "edit_cut", "edit_paste", etc.
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For reimplementation. */
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virtual void handleAction(const TQString& actionName) { Q_UNUSED(actionName); }
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protected:
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/*! Initializes this editor with \a add value, which should be somewhat added to the current
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value (already storted in m_origValue).
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If \a removeOld is true, a value should be set to \a add, otherwise
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-it should be set to current \a m_origValue + \a add, if possible.
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Implement this. */
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virtual void setValueInternal(const TQVariant& add, bool removeOld) = 0;
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/*! Initializes this editor with \a value visible value.
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This is currently used only in case of the combo box form widget, where displayed content
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(usually a text of image) differs from the value of the widget (a numeric index).
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For implementation in the combo box widget, by default does nothing. */
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virtual void setVisibleValueInternal(const TQVariant& value);
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// //! Sets value \a value for a widget.
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// //! Implement this method to allow setting value for this widget item.
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// virtual void setValueInternal(const TQVariant& value) = 0;
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/*! Call this in your implementation when value changes,
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so installed listener can react on this change. If there is a tqparent data item defined
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(see setParentDataItemInterface()), tqparent's signalValueChanged() method will be called instead. */
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virtual void signalValueChanged();
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/*! Used to perform some actions before signalValueChanged() call.
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We need this because the intrface is not TQObject and thus has got no real signals.
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Used in KexiDBComboBox. */
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virtual void beforeSignalValueChanged() {};
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KexiDataItemChangesListener* listener();
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//moved to KexiFormDataItemInterface: TQString m_dataSource;
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TQGuardedPtr<TQObject> m_listenerObject;
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KexiDataItemChangesListener* m_listener;
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bool m_listenerIsTQObject;
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TQVariant m_origValue;
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/*! @see parentDataItemInterface() */
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KexiDataItemInterface* m_parentDataItemInterface;
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bool m_hasFocusableWidget : 1;
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bool m_disable_signalValueChanged : 1;
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bool m_acceptEditorAfterDeleteContents : 1;
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};
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#endif
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