recovery: Implement sysbar

Add a system bar (navigation bar) similar to the main Android system
with back and home buttons.  This makes it easier for users to figure
out how to go back on devices that lack hardware buttons, and also
provides a quick way to get back to the main menu.

Note only buttons that do not have a hardware equivalent are shown, in
order to prevent redundancy and confusion.

Change-Id: I7538749978837571a8c250c3c8e54ac127b39d84

1 files changed, 64 insertions, 11 deletions

diff --git a/screen_ui.cpp b/screen_ui.cpp
index 8e6c733..849f6d1 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -77,6 +77,7 @@ ScreenRecoveryUI::ScreenRecoveryUI() :
     show_menu(false),
     menu_items(0),
     menu_sel(0),
+    sysbar_state(0),
     file_viewer_text_(nullptr),
     animation_fps(20),
     installing_frames(-1),
@@ -86,6 +87,10 @@ ScreenRecoveryUI::ScreenRecoveryUI() :
     wrap_count(0) {
 
     headerIcon = nullptr;
+    sysbarBackIcon = nullptr;
+    sysbarBackHighlightIcon = nullptr;
+    sysbarHomeIcon = nullptr;
+    sysbarHomeHighlightIcon = nullptr;
     for (int i = 0; i < NR_ICONS; i++) {
         backgroundIcon[i] = nullptr;
     }
@@ -281,6 +286,45 @@ void ScreenRecoveryUI::draw_menu_item(int textrow, const char *text, int selecte
     }
 }
 
+void ScreenRecoveryUI::draw_sysbar()
+{
+    GRSurface* surface;
+    int sw = gr_fb_width();
+    int sh = gr_fb_height();
+    int iw;
+    int ih;
+    SetColor(TEXT_FILL);
+    gr_fill(0, sh - sysbar_height_, sw, sh);
+
+    // Left third is back button
+    if (!HasBackKey()) {
+        if (sysbar_state & SYSBAR_BACK) {
+            surface = sysbarBackHighlightIcon;
+        }
+        else {
+            surface = sysbarBackIcon;
+        }
+        iw = gr_get_width(surface);
+        ih = gr_get_height(surface);
+        gr_blit(surface, 0, 0, iw, ih,
+                1 * (sw / 6) - (iw / 2), sh - ih);
+    }
+
+    // Middle third is home button
+    if (!HasHomeKey()) {
+        if (sysbar_state & SYSBAR_HOME) {
+            surface = sysbarHomeHighlightIcon;
+        }
+        else {
+            surface = sysbarHomeIcon;
+        }
+        iw = gr_get_width(surface);
+        ih = gr_get_height(surface);
+        gr_blit(surface, 0, 0, iw, ih,
+                3 * (sw / 6) - (iw / 2), sh - ih);
+    }
+}
+
 void ScreenRecoveryUI::draw_dialog()
 {
     int x, y, w, h;
@@ -289,6 +333,7 @@ void ScreenRecoveryUI::draw_dialog()
        return;
     }
     draw_header_icon();
+    draw_sysbar();
 
     int iconHeight = gr_get_height(backgroundIcon[dialog_icon]);
 
@@ -374,9 +419,9 @@ void ScreenRecoveryUI::draw_screen_locked() {
         }
 
         if (show_menu) {
-            int i;
+            int i, y;
             draw_header_icon();
-            int y;
+            draw_sysbar();
 
             // Divider
             y = text_first_row_ * char_height_;
@@ -519,23 +564,31 @@ void ScreenRecoveryUI::Init() {
     gr_font_size(&log_char_width_, &log_char_height_);
     gr_set_font("menu");
     gr_font_size(&char_width_, &char_height_);
-    text_rows_ = gr_fb_height() / char_height_;
-    text_cols_ = gr_fb_width() / char_width_;
-
-    log_text_rows_ = gr_fb_height() / log_char_height_;
-    log_text_cols_ = gr_fb_width() / log_char_width_;
-
-    text_ = Alloc2d(log_text_rows_, log_text_cols_ + 1);
-    file_viewer_text_ = Alloc2d(text_rows_, text_cols_ + 1);
-    menu_ = Alloc2d(text_rows_, text_cols_ + 1);
 
     text_col_ = text_row_ = 0;
     text_top_ = 1;
 
     LoadBitmap("icon_header", &headerIcon);
+    LoadBitmap("icon_sysbar_back", &sysbarBackIcon);
+    LoadBitmap("icon_sysbar_back_highlight", &sysbarBackHighlightIcon);
+    LoadBitmap("icon_sysbar_home", &sysbarHomeIcon);
+    LoadBitmap("icon_sysbar_home_highlight", &sysbarHomeHighlightIcon);
+
     header_height_ = gr_get_height(headerIcon);
     header_width_ = gr_get_width(headerIcon);
 
+    sysbar_height_ = gr_get_height(sysbarBackIcon);
+
+    text_rows_ = (gr_fb_height() - sysbar_height_) / char_height_;
+    text_cols_ = gr_fb_width() / char_width_;
+
+    log_text_rows_ = (gr_fb_height() - sysbar_height_) / log_char_height_;
+    log_text_cols_ = gr_fb_width() / log_char_width_;
+
+    text_ = Alloc2d(log_text_rows_, log_text_cols_ + 1);
+    file_viewer_text_ = Alloc2d(text_rows_, text_cols_ + 1);
+    menu_ = Alloc2d(text_rows_, text_cols_ + 1);
+
     text_first_row_ = (header_height_ / char_height_) + 1;
     menu_item_start_ = text_first_row_ * char_height_;
     max_menu_rows_ = (text_rows_ - text_first_row_) / 3;