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/*
* Copyright (C) 2011 Emweb bvba, Kessel-Lo, Belgium.
*
* See the LICENSE file for terms of use.
*/
#ifndef WT_WTEMPLATE_FORM_VIEW_H_
#define WT_WTEMPLATE_FORM_VIEW_H_
#include <Wt/WTemplate>
#include <Wt/WFormModel>
#include <Wt/WFormWidget>
namespace Wt {
/*! \class WTemplateFormView Wt/WTemplateFormView
* \brief A template-based View class form models.
*
* This implements a View to be used in conjunction with WFormModel
* models to implement forms.
*
* For each model field, it uses a number of conventional template placholder
* variables to represent the label, editor, and validation messages in the
* template. For a field name '<i>field</i>', we have:
* - '<i>field</i>': the actual (form) widget for viewing/editing the value
* - '<i>field</i>-label': the label text
* - '<i>field</i>-info': a text that contains help or validation messages
* - 'if:<i>field</i>': condition for the visibility of the field
*
* A typical template uses blocks of the following-format (in the example below
* illustrated for a field 'UserName'):
*
* \verbatim
${<if:UserName>}
<label for="${id:UserName}">${UserName-label}</label>
${UserName} ${UserName-info}
${</if:UserName>}\endverbatim
*
* The View may render fields of more than one model, and does not
* necessarily need to render all information of each model. The latter
* can be achieved by either calling updateViewField() and updateModelField()
* for individual model fields, or by hiding fields in the model that are not
* to be shown in the view.
*
* The updateView() method updates the view based on a model (e.g. to
* propagate changed values or validation feed-back), while the
* updateModel() method updates the model with values entered in the View.
*
* The view is passive: it will not perform any updates by itself of either
* the View or Model. You will typically bind a method to the Ok button
* and do:
* \if cpp
* \code
* void MyView::okClicked()
* {
* updateModel(model_);
* if (model_->validate()) {
* ...
* } else {
* updateView(model_);
* }
* }
* \endcode
* \elseif java
* \code
* void okClicked()
* {
* updateModel(this.model);
* if (this.model.validate()) {
* ...
* } else {
* updateView(this.model);
* }
* }
* \endcode
* \endif
*/
class WT_API WTemplateFormView : public WTemplate
{
public:
/*! \brief Constructor.
*
* For convenience, this initializes the template with:
* \if cpp
* \code
* addFunction("id", &Functions::id);
* addFunction("tr", &Functions::tr);
* addFunction("block", &Functions::block);
* \endcode
* \elseif java
* \code
* addFunction("id", Functions.id);
* addFunction("tr", Functions.tr);
* addFunction("block", Functions.block);
* \endcode
* \endif
*/
WTemplateFormView(WContainerWidget *parent = 0);
/*! \brief Constructor.
*
* For convenience, this initializes the template with:
* \if cpp
* \code
* addFunction("id", &Functions::id);
* addFunction("tr", &Functions::tr);
* addFunction("block", &Functions::block);
* \endcode
* \elseif java
* \code
* addFunction("id", Functions.id);
* addFunction("tr", Functions.tr);
* addFunction("block", Functions.block);
* \endcode
* \endif
*/
WTemplateFormView(const WString& text, WContainerWidget *parent = 0);
/*! \brief Sets the form widget for a given field.
*
* When the \p widget is a form widget, then the View class will use
* WFormWidget::setValueText() to update it with model values, and
* WFormWidget::valueText() to update the model with view data.
*
* You can override this default behaviour by either using the
* overloaded setFormWidget() that allows to specify these
* functions, or reimplement updateViewValue() or updateModelValue().
*/
void setFormWidget(WFormModel::Field field, WWidget *widget);
#ifndef WT_TARGET_JAVA
/*! \brief Sets the form widget for a given field.
*
* This overloaded functions allows functions to be provided to update the view
* and model for this field.
*/
void setFormWidget(WFormModel::Field field, WWidget *widget,
const boost::function<void ()>& updateViewValue,
const boost::function<void ()>& updateModelValue);
#else
#ifdef WT_BUILDING
template<typename F1, typename F2>
void setFormWidget(WFormModel::Field field, WWidget *widget,
F1 updateViewValue, F2 updateModelValue);
#endif
/*! \brief Interface for custom update methods for field data.
*/
class FieldView
{
public:
/*! \brief Update the widget's value based on the model's data.
*/
void updateViewValue() = 0;
/*! \brief Update the model's data based on the widget's value.
*/
void updateModelValue() = 0;
};
/*! \brief Sets the form widget for a given field.
*
* This overloaded functions allows functions to be provided to update the view
* and model for this field.
*/
void setFormWidget(WFormModel::Field field, WWidget *formWidget,
FieldView *fieldView);
#endif
/*! \brief Updates the View.
*
* This creates or updates all fields in the view.
*
* \sa updateViewField(), WFormModel::fields()
*/
virtual void updateView(WFormModel *model);
/*! \brief Creates or updates a field in the View.
*
* This will update or create and bind widgets in the template to represent
* the field. To create the form widget that implements the editing, it
* calls createFormWidget().
*
* The default behaviour interprets WFormModel::isVisible(),
* WFormModel::isReadOnly(), WFormModel::label() and
* WFormModel::validator() to update the View, and calls
* updateViewValue() to update the view value. If no form widget has
* been set for the given \c field using setFormWidget(), then it
* calls createFormWidget() to try to create one.
*
* It's usually more convenient to reimplement updateViewValue() to
* override specifically how the value from the model should be used
* to update the form widget.
*/
virtual void updateViewField(WFormModel *model, WFormModel::Field field);
/*! \brief Updates the value in the View.
*
* The default implementation calls updateViewValue(WFormModel *,
* WFormField::Field, WWidget *). If this function returned \c
* false, it sets WFormModel::valueText() into
* WFormWidget::setValueText().
*/
virtual void updateViewValue(WFormModel *model, WFormModel::Field field,
WFormWidget *edit);
/*! \brief Updates the value in the View.
*
* The default implementation considers only a specialized update
* function that may have been configured in setFormWidget() and
* returns \c false if no such function was configured.
*/
virtual bool updateViewValue(WFormModel *model, WFormModel::Field field,
WWidget *edit);
/*! \brief Updates the Model.
*
* This creates or updates all field values in the model.
*
* \sa updateModelField(), WFormModel::fields()
*/
virtual void updateModel(WFormModel *model);
/*! \brief Updates a field in the Model.
*
* This calls updateModelValue() to update the model value.
*/
virtual void updateModelField(WFormModel *model, WFormModel::Field field);
/*! \brief Updates a value in the Model.
*
* The default implementation calls
* updateModelValue(WFormModel *, WFormModel::Field, WWidget *). If this function
* returned \c false, it calls WFormModel::setValue() with WFormWidget::valueText().
*/
virtual void updateModelValue(WFormModel *model, WFormModel::Field field,
WFormWidget *edit);
/*! \brief Updates a value in the Model.
*
* The default implementation considers only a specialized update
* function that may have been configured in setFormWidget() and
* returns \c false if no such function was configured.
*/
virtual bool updateModelValue(WFormModel *model, WFormModel::Field field,
WWidget *edit);
protected:
/*! \brief Creates a form widget.
*
* This method is called by updateViewField() when it needs to
* create a form widget for a field, and none was specified using
* setFormWidget().
*/
virtual WWidget *createFormWidget(WFormModel::Field field);
/*! \brief Indicates the validation result.
*
* The default implementation calls WTheme::applyValidationStyle()
*
* \note We changed the signature to take an edit WWidget instead of
* WFormWidget in %Wt 3.3.1!
*/
virtual void indicateValidation(WFormModel::Field field,
bool validated,
WText *info,
WWidget *edit,
const WValidator::Result& validation);
private:
struct FieldData {
FieldData();
WWidget *formWidget;
#ifndef WT_TARGET_JAVA
boost::function<void ()> updateView, updateModel;
#else
FieldView *updateFunctions;
#endif
};
typedef std::map<std::string, FieldData> FieldMap;
FieldMap fields_;
void init();
};
}
#endif // WT_TEMPLATE_FORM_VIEW_H_
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