modal_view_controller.cpp
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#include <escher/modal_view_controller.h>
#include <escher/app.h>
#include <assert.h>
ModalViewController::ContentView::ContentView() :
View(),
m_regularView(nullptr),
m_currentModalView(nullptr),
m_isDisplayingModal(false),
m_verticalAlignment(0.0f),
m_horizontalAlignment(0.0f),
m_topMargin(0),
m_leftMargin(0),
m_bottomMargin(0),
m_rightMargin(0)
{
}
void ModalViewController::ContentView::setMainView(View * regularView) {
if (m_regularView != regularView) {
m_regularView = regularView;
}
}
int ModalViewController::ContentView::numberOfSubviews() const {
KDRect regularFrame = bounds();
KDRect modalFrame = frame();
bool shouldDrawTheRegularViewBehind = !modalFrame.contains(regularFrame.topLeft()) || !modalFrame.contains(regularFrame.bottomRight());
return 1 + (m_isDisplayingModal && shouldDrawTheRegularViewBehind);
}
View * ModalViewController::ContentView::subviewAtIndex(int index) {
switch (index) {
case 0:
if (m_isDisplayingModal && numberOfSubviews() == 1) {
return m_currentModalView;
}
return m_regularView;
case 1:
if (numberOfSubviews() == 2) {
return m_currentModalView;
} else {
assert(false);
return nullptr;
}
default:
assert(false);
return nullptr;
}
}
KDRect ModalViewController::ContentView::frame() const {
KDSize modalSize = m_isDisplayingModal ? m_currentModalView->minimalSizeForOptimalDisplay() : KDSize(0,0);
KDCoordinate modalHeight = modalSize.height();
modalHeight = modalHeight == 0 ? bounds().height()-m_topMargin-m_bottomMargin : modalHeight;
KDCoordinate modalWidth = modalSize.width();
modalWidth = modalWidth == 0 ? bounds().width()-m_leftMargin-m_rightMargin : modalWidth;
KDRect modalViewFrame(m_leftMargin + m_horizontalAlignment*(bounds().width()-m_leftMargin-m_rightMargin-modalWidth),
m_topMargin+m_verticalAlignment*(bounds().height()-m_topMargin-m_bottomMargin-modalHeight), modalWidth, modalHeight);
return modalViewFrame;
}
void ModalViewController::ContentView::layoutSubviews() {
assert(m_regularView != nullptr);
m_regularView->setFrame(bounds());
if (m_isDisplayingModal) {
assert(m_currentModalView != nullptr);
m_currentModalView->setFrame(frame());
}
}
void ModalViewController::ContentView::presentModalView(View * modalView, float verticalAlignment, float horizontalAlignment,
KDCoordinate topMargin, KDCoordinate leftMargin, KDCoordinate bottomMargin, KDCoordinate rightMargin) {
m_isDisplayingModal = true;
m_currentModalView = modalView;
m_horizontalAlignment = horizontalAlignment;
m_verticalAlignment = verticalAlignment;
m_topMargin = topMargin;
m_leftMargin = leftMargin;
m_bottomMargin = bottomMargin;
m_rightMargin = rightMargin;
markRectAsDirty(frame());
layoutSubviews();
}
void ModalViewController::ContentView::dismissModalView() {
m_isDisplayingModal = false;
markRectAsDirty(frame());
m_currentModalView->resetSuperview();
m_currentModalView = nullptr;
layoutSubviews();
}
bool ModalViewController::ContentView::isDisplayingModal() const {
return m_isDisplayingModal;
}
ModalViewController::ModalViewController(Responder * parentResponder, ViewController * child) :
ViewController(parentResponder),
m_contentView(),
m_previousResponder(child),
m_currentModalViewController(nullptr),
m_regularViewController(child)
{
}
View * ModalViewController::view() {
return &m_contentView;
}
bool ModalViewController::isDisplayingModal() {
return m_contentView.isDisplayingModal();
}
void ModalViewController::displayModalViewController(ViewController * vc, float verticalAlignment, float horizontalAlignment,
KDCoordinate topMargin, KDCoordinate leftMargin, KDCoordinate bottomMargin, KDCoordinate rightMargin) {
m_currentModalViewController = vc;
vc->setParentResponder(this);
m_previousResponder = app()->firstResponder();
m_contentView.presentModalView(vc->view(), verticalAlignment, horizontalAlignment, topMargin, leftMargin, bottomMargin, rightMargin);
m_currentModalViewController->viewWillAppear();
app()->setFirstResponder(vc);
}
void ModalViewController::dismissModalViewController() {
m_currentModalViewController->viewDidDisappear();
app()->setFirstResponder(m_previousResponder);
m_contentView.dismissModalView();
m_currentModalViewController = nullptr;
}
void ModalViewController::didBecomeFirstResponder() {
if (m_contentView.isDisplayingModal()) {
app()->setFirstResponder(m_currentModalViewController);
}
app()->setFirstResponder(m_regularViewController);
}
bool ModalViewController::handleEvent(Ion::Events::Event event) {
if (!m_contentView.isDisplayingModal()) {
return false;
}
if (event == Ion::Events::Back) {
dismissModalViewController();
return true;
}
return false;
}
void ModalViewController::viewWillAppear() {
m_contentView.setMainView(m_regularViewController->view());
m_contentView.layoutSubviews();
if (m_contentView.isDisplayingModal()) {
m_currentModalViewController->viewWillAppear();
}
m_regularViewController->viewWillAppear();
}
void ModalViewController::viewDidDisappear() {
if (m_contentView.isDisplayingModal()) {
m_currentModalViewController->viewDidDisappear();
}
m_regularViewController->viewDidDisappear();
}