Files
PDF4QT/Pdf4QtLibWidgets/sources/pdfwidgetformmanager.h
2025-04-27 12:39:06 +02:00

199 lines
8.1 KiB
C++

// MIT License
//
// Copyright (c) 2018-2025 Jakub Melka and Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#ifndef PDFWIDGETFORMMANAGER_H
#define PDFWIDGETFORMMANAGER_H
#include "pdfwidgetsglobal.h"
#include "pdfform.h"
#include "pdfdocumentdrawinterface.h"
namespace pdf
{
class PDFDrawWidgetProxy;
class PDFWidgetAnnotationManager;
class PDFWidgetFormManager;
/// Base class for editors of form fields. It enables editation
/// of form fields, such as entering text, clicking on check box etc.
class PDF4QTLIBWIDGETSSHARED_EXPORT PDFFormFieldWidgetEditor
{
public:
explicit PDFFormFieldWidgetEditor(PDFWidgetFormManager* formManager, PDFFormWidget formWidget);
virtual ~PDFFormFieldWidgetEditor() = default;
virtual void shortcutOverrideEvent(QWidget* widget, QKeyEvent* event);
virtual void keyPressEvent(QWidget* widget, QKeyEvent* event);
virtual void keyReleaseEvent(QWidget* widget, QKeyEvent* event);
virtual void mousePressEvent(QWidget* widget, QMouseEvent* event, const QPointF& mousePagePosition);
virtual void mouseDoubleClickEvent(QWidget* widget, QMouseEvent* event, const QPointF& mousePagePosition);
virtual void mouseReleaseEvent(QWidget* widget, QMouseEvent* event, const QPointF& mousePagePosition);
virtual void mouseMoveEvent(QWidget* widget, QMouseEvent* event, const QPointF& mousePagePosition);
virtual void wheelEvent(QWidget* widget, QWheelEvent* event, const QPointF& mousePagePosition);
virtual void reloadValue() { }
virtual bool isEditorDrawEnabled() const { return false; }
virtual QRectF getActiveEditorRectangle() const { return QRectF(); }
const PDFFormWidget* getFormWidget() const { return &m_formWidget; }
PDFFormField* getFormField() const { return m_formWidget.getParent(); }
PDFObjectReference getWidgetAnnotation() const { return m_formWidget.getWidget(); }
void setFocus(bool hasFocus);
/// Draw form field widget using given parameters. It is used, when
/// we want to draw editor contents on the painter using parameters.
/// Parameter \p edit decides, if editor is drawn, or static contents
/// based on field value is drawn.
/// \param parameters Parameters
/// \param edit Draw editor or static contents
virtual void draw(AnnotationDrawParameters& parameters, bool edit) const;
protected:
/// This function is called every time, the focus state changes
/// \param focused If editor was focused, or not
virtual void setFocusImpl(bool focused) { Q_UNUSED(focused); }
void performKeypadNavigation(QWidget* widget, QKeyEvent* event);
PDFWidgetFormManager* m_formManager;
PDFFormWidget m_formWidget;
bool m_hasFocus;
};
class PDF4QTLIBWIDGETSSHARED_EXPORT PDFWidgetFormManager : public PDFFormManager, public IDrawWidgetInputInterface
{
Q_OBJECT
private:
using BaseClass = PDFFormManager;
public:
explicit PDFWidgetFormManager(PDFDrawWidgetProxy* proxy, QObject* parent);
virtual ~PDFWidgetFormManager() override;
// interface IDrawWidgetInputInterface
virtual void shortcutOverrideEvent(QWidget* widget, QKeyEvent* event) override;
virtual void keyPressEvent(QWidget* widget, QKeyEvent* event) override;
virtual void keyReleaseEvent(QWidget* widget, QKeyEvent* event) override;
virtual void mousePressEvent(QWidget* widget, QMouseEvent* event) override;
virtual void mouseDoubleClickEvent(QWidget* widget, QMouseEvent* event) override;
virtual void mouseReleaseEvent(QWidget* widget, QMouseEvent* event) override;
virtual void mouseMoveEvent(QWidget* widget, QMouseEvent* event) override;
virtual void wheelEvent(QWidget* widget, QWheelEvent* event) override;
virtual int getInputPriority() const override;
virtual QString getTooltip() const override;
virtual const std::optional<QCursor>& getCursor() const override;
/// Tries to set focus on next/previous form field in the focus chain.
/// Function returns true, if focus has been successfully set.
/// \param next Focus next (true) or previous (false) widget
bool focusNextPrevFormField(bool next);
/// Sets focus to the editor. Is is allowed to pass nullptr to this
/// function, it means that no editor is focused.
/// \param editor Editor to be focused
void setFocusToEditor(PDFFormFieldWidgetEditor* editor);
/// Returns true, if widget is focused.
/// \param widget Widget annotation reference
virtual bool isFocused(PDFObjectReference widget) const override;
/// Returns editor for form field
PDFFormFieldWidgetEditor* getEditor(const PDFFormField* formField) const;
struct MouseEventInfo
{
/// Form field under mouse event, nullptr, if
/// no form field is under mouse button.
PDFFormField* formField = nullptr;
/// Form field widget editor, which is associated
/// with given form field.
PDFFormFieldWidgetEditor* editor = nullptr;
/// Mouse position in form field coordinate space
QPointF mousePosition;
/// Matrix, which maps from device space to widget space
QTransform deviceToWidget;
/// Returns true, if mouse event info is valid, i.e.
/// mouse event occurs above some form field.
bool isValid() const { return editor != nullptr; }
};
virtual bool isEditorDrawEnabled(const PDFObjectReference& reference) const override;
virtual bool isEditorDrawEnabled(const PDFFormField* formField) const override;
virtual void drawFormField(const PDFFormField* formField, AnnotationDrawParameters& parameters, bool edit) const override;
PDFWidgetAnnotationManager* getAnnotationManager() const;
void setAnnotationManager(PDFWidgetAnnotationManager* annotationManager);
PDFDrawWidgetProxy* getProxy() const { return m_proxy; }
protected:
virtual void updateFieldValues() override;
virtual void onDocumentReset() override;
private:
void updateFormWidgetEditors();
/// Releases all form widget editors
void clearEditors();
MouseEventInfo getMouseEventInfo(QWidget* widget, QPoint point);
struct MouseGrabInfo
{
MouseEventInfo info;
int mouseGrabNesting = 0;
bool isMouseGrabbed() const { return mouseGrabNesting > 0; }
};
bool isMouseGrabbed() const { return m_mouseGrabInfo.isMouseGrabbed(); }
/// Grabs mouse input, if mouse is already grabbed, or if event
/// is accepted. When mouse is grabbed, then mouse input events
/// are sent to active editor and are automatically accepted.
/// \param info Mouse event info
/// \param event Mouse event
void grabMouse(const MouseEventInfo& info, QMouseEvent* event);
/// Release mouse input
/// \param info Mouse event info
/// \param event Mouse event
void ungrabMouse(const MouseEventInfo& info, QMouseEvent* event);
PDFWidgetAnnotationManager* m_annotationManager;
PDFDrawWidgetProxy* m_proxy;
MouseGrabInfo m_mouseGrabInfo;
std::optional<QCursor> m_mouseCursor;
std::vector<PDFFormFieldWidgetEditor*> m_widgetEditors;
PDFFormFieldWidgetEditor* m_focusedEditor;
};
} // namespace pdf
#endif // PDFWIDGETFORMMANAGER_H