[apps/shared] Add Discard confirmation pop-up

Change-Id: Ida3878894090ecfa99145618b8e1ff0bbcb4743a

escher/Makefile

@@ -51,6 +51,7 @@ escher_src += $(addprefix escher/src/,\
   nested_menu_controller.cpp \
   palette.cpp \
   pointer_text_view.cpp \
+  pop_up_controller.cpp \
   responder.cpp \
   run_loop.cpp \
   scroll_view.cpp \

escher/include/escher/pop_up_controller.h

@@ -0,0 +1,46 @@
+#ifndef ESCHER_POP_UP_CONTROLLER_H
+#define ESCHER_POP_UP_CONTROLLER_H
+
+#include <escher/invocation.h>
+#include <apps/i18n.h>
+
+
+class HighContrastButton : public Button {
+public:
+  using Button::Button;
+  KDColor highlightedBackgroundColor() const override { return Palette::YellowDark; }
+};
+
+class PopUpController : public ViewController {
+public:
+  PopUpController(int numberOfLines, Invocation OkInvocation);
+  View * view() override;
+  void didBecomeFirstResponder() override;
+  bool handleEvent(Ion::Events::Event event) override;
+protected:
+  class ContentView : public View, public Responder {
+  public:
+    ContentView(Responder * parentResponder, int numberOfLines, Invocation okInvocation);
+    void drawRect(KDContext * ctx, KDRect rect) const override { ctx->fillRect(bounds(), KDColorBlack); }
+    void setSelectedButton(int selectedButton);
+    int selectedButton();
+    void setMessage(int index, I18n::Message message);
+  private:
+    constexpr static KDCoordinate k_buttonMargin = 10;
+    constexpr static KDCoordinate k_buttonHeight = 20;
+    constexpr static KDCoordinate k_topMargin = 8;
+    constexpr static KDCoordinate k_paragraphHeight = 20;
+    int numberOfSubviews() const override;
+    View * subviewAtIndex(int index) override;
+    void layoutSubviews(bool force = false) override;
+    HighContrastButton m_cancelButton;
+    HighContrastButton m_okButton;
+    MessageTextView m_warningTextView;
+    const int m_numberOfLines;
+    constexpr static int k_maxNumberOfLines = 4;
+    MessageTextView m_messageTextViews[k_maxNumberOfLines];
+  };
+  ContentView m_contentView;
+};
+
+#endif

escher/src/pop_up_controller.cpp

@@ -0,0 +1,107 @@
+#include <escher/pop_up_controller.h>
+#include <assert.h>
+
+PopUpController::PopUpController(int numberOfLines, Invocation OkInvocation) :
+  ViewController(nullptr),
+  m_contentView(this, numberOfLines, OkInvocation)
+{
+}
+
+View * PopUpController::view() {
+  return &m_contentView;
+}
+
+void PopUpController::didBecomeFirstResponder() {
+  m_contentView.setSelectedButton(0);
+}
+
+bool PopUpController::handleEvent(Ion::Events::Event event) {
+  if (event == Ion::Events::Left && m_contentView.selectedButton() == 1) {
+    m_contentView.setSelectedButton(0);
+    return true;
+  }
+  if (event == Ion::Events::Right && m_contentView.selectedButton() == 0) {
+    m_contentView.setSelectedButton(1);
+    return true;
+  }
+  return false;
+}
+
+PopUpController::ContentView::ContentView(Responder * parentResponder, int numberOfLines, Invocation okInvocation) :
+  Responder(parentResponder),
+  m_cancelButton(
+    this, I18n::Message::Cancel,
+    Invocation(
+      [](void * context, void * sender) {
+        Container::activeApp()->dismissModalViewController();
+        return true;
+      }, this),
+    KDFont::SmallFont),
+  m_okButton(this, I18n::Message::Ok, okInvocation, KDFont::SmallFont),
+  m_warningTextView(KDFont::SmallFont, I18n::Message::Warning, 0.5, 0.5, KDColorWhite, KDColorBlack),
+  m_numberOfLines(numberOfLines),
+  m_messageTextViews{}
+{
+  assert(m_numberOfLines <= k_maxNumberOfLines && m_numberOfLines >= 0);
+  for (int i = 0; i < m_numberOfLines; i++) {
+    m_messageTextViews[i].setFont(KDFont::SmallFont);
+    m_messageTextViews[i].setAlignment(0.5f, 0.5f);
+    m_messageTextViews[i].setBackgroundColor(KDColorBlack);
+    m_messageTextViews[i].setTextColor(KDColorWhite);
+  }
+}
+
+void PopUpController::ContentView::setSelectedButton(int selectedButton) {
+  m_cancelButton.setHighlighted(selectedButton == 0);
+  m_okButton.setHighlighted(selectedButton == 1);
+  Container::activeApp()->setFirstResponder(selectedButton == 0 ? &m_cancelButton : &m_okButton);
+}
+
+int PopUpController::ContentView::selectedButton() {
+  return m_cancelButton.isHighlighted() ? 0 : 1;
+}
+
+void PopUpController::ContentView::setMessage(int index, I18n::Message message) {
+  assert(index >=0 && index < m_numberOfLines);
+  m_messageTextViews[index].setMessage(message);
+}
+
+int PopUpController::ContentView::numberOfSubviews() const {
+  // MessageTextViews + WarningTextView + CancelButton + OkButton
+  return m_numberOfLines + 3;
+}
+
+View * PopUpController::ContentView::subviewAtIndex(int index) {
+  int totalSubviews = numberOfSubviews();
+  if (index < 0 || index >= totalSubviews) {
+    assert(false);
+    return nullptr;
+  }
+  if (index == 0) {
+    return &m_warningTextView;
+  }
+  if (index == totalSubviews - 2) {
+    return &m_cancelButton;
+  }
+  if (index == totalSubviews - 1) {
+    return &m_okButton;
+  }
+  return &m_messageTextViews[index-1];
+}
+
+void PopUpController::ContentView::layoutSubviews(bool force) {
+  KDCoordinate height = bounds().height();
+  KDCoordinate width = bounds().width();
+  KDCoordinate textHeight = KDFont::SmallFont->glyphSize().height();
+  m_warningTextView.setFrame(KDRect(0, k_topMargin, width, textHeight), force);
+
+  // Offset to center text vertically
+  const int offset = (k_maxNumberOfLines - m_numberOfLines) / 2;
+
+  for (int i = 0; i < m_numberOfLines; i++) {
+    m_messageTextViews[i].setFrame(KDRect(0, k_topMargin + k_paragraphHeight + (i + 1 + offset) * textHeight, width, textHeight), force);
+  }
+
+  m_cancelButton.setFrame(KDRect(k_buttonMargin, height - k_buttonMargin - k_buttonHeight, (width - 3 * k_buttonMargin) / 2, k_buttonHeight), force);
+  m_okButton.setFrame(KDRect(2 * k_buttonMargin + (width - 3 * k_buttonMargin) / 2, height - k_buttonMargin - k_buttonHeight, (width - 3 * k_buttonMargin) / 2, k_buttonHeight), force);
+}