Add on-screen keyboard to InkHUD (#9445)

* Added keyboard option to menu. Shows a keyboard layout but does not type.

* Keyboard types into text box and wraps.

* send FreeText messages from the send submenu

- renamed `KEYBOARD` action to `FREE_TEXT` and moved its menu location
to the send submenu
- opening the FreeText applet from the menu keeps the menu open and
disabled the timeout
- the FreeText applet writes to inkhud->freetext
- the sending a canned message checks inkhud->freetext and if it isn't
empty, sends and clears the inkhud->freetext

* Text scrolls along with input

* handle free text message completion as an event

implements `handleFreeText` and `OnFreeText()` for system applets to
interface with the FreeText Applet

The FreeText Applet generates an `OnFreeText` event when completing a
message which is handled by the first system applet with the
`handleFreeText` flag set to true.

The Menu Applet now handles this event.

* call `onFreeText` whenever the FreeText Applet exits

allows the menu to consistently restart its auto-close timeout

* Add text cursor

* Change UI to remove the header and make text box longer
Keyboard displays captial letters for legibility
Keyboard types captial letters with long press

* center FreeText keys and draw symbolic buttons

Move input field and keyboard drawing to their own functions:
- `drawInputField()`
- `drawKeyboard()`

Store the keys in a 1-dimensional array

Implement a matching array, `keyWidths`, to set key widths relative to
the font size

* Add character limit and counter

* Fix softlock when hitting character limit

* Move text box as its own menu page

* rework FreeTextApplet into KeyboardApplet

- The Keyboard Applet renders an on-screen keyboard at the lower portion
of the screen.
- Calling `inkhud->openKeyboard()` sends all the user applets to the
background and resizes the first system applet with `handleFreeText` set
to True to fit above the on-screen keyboard
- `inkhud->closeKeyboard()` reverses this layout change

* Fix input box rendering and add character limit to menu free text

* remove FREE_TEXT menu page and use the FREE_TEXT menu action solely

* force update when changing the free text message

* reorganize KeyboardApplet

- add comments after each row of `key[]` and `keyWidths[]` to preserve
formatting

- The selected key is now set using the key index directly

- rowWidths are pre-calculated in the KeyboardApplet constructor

- removed `drawKeyboard()` and implemented `drawKeyLabel()`

* implement `Renderer::clearTile()` to clear the region below a tile

* add parameter to forceUpdate() for re-rendering the full screen

setting the `all` parameter to true in `inkhud->forceUpdate()` now
causes the full screen buffer to clear an re-render. This is helpful for
when sending applets to the background and the UI needs a clean canvas.

System Applets can now set the `alwaysRender` flag true which causes it
to re-render on every screen update. This is set to true in the Battery
Icon Applet.

* clean up tile clearing loops

* implement dirty rendering to let applets draw over their previous render

- `Applet::requestUpdate()` now has an optional flag to keep the old
canvas

- If honored, the renderer calls `render(true)` which runs
`onDirtyRender()` instead of `onRender()` for said applet

- The renderer will not call a dirty render if the full screen is
getting re-rendered

* simplify arithmetic in clearTile for better understanding

* combine Applet::onRender() and Applet::onDirtyRender() into Applet::onRender(bool full)

- add new `full` parameter to onRender() in every applet. This parameter
can be ignored by most applets.

- `Applet::requestUpdate()` has an optional flag that requests a full
render by default

* implement tile and partial rendering in KeyboardApplet

* add comment for drawKeyLabel()

* improve clarity of byte operations in clearTile()

* remove typo and commented code

* fix inaccurate comments

* add null check to openKeyboard() and closeKeyboard()

---------

Co-authored-by: zeropt <ferr0fluidmann@gmail.com>
Co-authored-by: HarukiToreda <116696711+HarukiToreda@users.noreply.github.com>

src/graphics/niche/InkHUD/Applet.cpp

@@ -55,7 +55,7 @@ InkHUD::Tile *InkHUD::Applet::getTile()
 }
 
 // Draw the applet
-void InkHUD::Applet::render()
+void InkHUD::Applet::render(bool full)
 {
     assert(assignedTile);                              // Ensure that we have a tile
     assert(assignedTile->getAssignedApplet() == this); // Ensure that we have a reciprocal link with the tile
@@ -65,10 +65,11 @@ void InkHUD::Applet::render()
     wantRender = false;                                       // Flag set by requestUpdate
     wantAutoshow = false;                                     // Flag set by requestAutoShow. May or may not have been honored.
     wantUpdateType = Drivers::EInk::UpdateTypes::UNSPECIFIED; // Update type we wanted. May on may not have been granted.
+    wantFullRender = true;                                    // Default to a full render
 
     updateDimensions();
     resetDrawingSpace();
-    onRender(); // Derived applet's drawing takes place here
+    onRender(full); // Draw the applet
 
     // Handle "Tile Highlighting"
     // Some devices may use an auxiliary button to switch between tiles
@@ -115,6 +116,11 @@ Drivers::EInk::UpdateTypes InkHUD::Applet::wantsUpdateType()
     return wantUpdateType;
 }
 
+bool InkHUD::Applet::wantsFullRender()
+{
+    return wantFullRender;
+}
+
 // Get size of the applet's drawing space from its tile
 // Performed immediately before derived applet's drawing code runs
 void InkHUD::Applet::updateDimensions()
@@ -142,10 +148,11 @@ void InkHUD::Applet::resetDrawingSpace()
 // Once the renderer has given other applets a chance to process whatever event we just detected,
 // it will run Applet::render(), which may draw our applet to screen, if it is shown (foreground)
 // We should requestUpdate even if our applet is currently background, because this might be changed by autoshow
-void InkHUD::Applet::requestUpdate(Drivers::EInk::UpdateTypes type)
+void InkHUD::Applet::requestUpdate(Drivers::EInk::UpdateTypes type, bool full)
 {
     wantRender = true;
     wantUpdateType = type;
+    wantFullRender = full;
     inkhud->requestUpdate();
 }