Add flip icon for empty draw pile

LICENSE-THIRD-PARTY.txt

@@ -1,3 +1,6 @@
 The set of playing card SVG images located in the /img/playing_cards/ directory was sourced from the following website:
 <https://www.tekeye.uk/playing_cards/svg-playing-cards>
 These images are licensed under the public domain, and the resources were created by <dan@tekeye.uk>.
+
+The /img/flip_icon.svg icon was sourced from <https://freesvgicons.com>, specifically, it belongs to the Streamline pack <https://freesvgicons.com/packs/streamline>.
+This icon is licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/deed.en).

img/flip_icon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="undefined" height="undefined" viewBox="0 0 14 14"><g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"><path d="M.5 5L3 2.5L5.5 5"/><path d="M6 13.5H4a1 1 0 0 1-1-1v-10M13.5 9L11 11.5L8.5 9"/><path d="M8 .5h2a1 1 0 0 1 1 1v10"/></g></svg>

qml/DrawPile.qml

@@ -1,9 +1,15 @@
 import QtQuick
 import Solitare
 
-// Shows the top card facing down
-// (or a blank card if the pile is empty)
-CardModel {
+Item {
+    id: drawPile
+    width: drawPileCard.width
+    height: drawPileCard.height
+
+    CardModel {
+        id: drawPileCard
+        anchors.fill: parent
+
         card: GameState.drawPile.length > 0 ? GameState.drawPile[GameState.drawPile.length - 1] : null
         isFaceDown: GameState.drawPile.length > 0 ? true : false
         onClicked: {
@@ -15,4 +21,36 @@ CardModel {
                 }
             }
         }
+        z: 0
+    }
+
+    Rectangle {
+        id: cardCountBackground
+
+        color: "black"
+        opacity: 0.7
+        visible: cardCount.visible
+
+        width: cardCount.width + 8 // 8px padding
+        height: cardCount.height + 8 // ^^
+
+        anchors.bottom: parent.bottom
+        anchors.left: parent.left
+        anchors.margins: 4
+        radius: 4 // rounded borders
+        z: 1 // Behind the text, but above the card
+    }
+
+    Text {
+        id: cardCount
+
+        text: GameState.drawPile.length
+        visible: GameState.drawPile.length > 0
+        color: "white"
+        font.pixelSize: 16
+        font.bold: true
+
+        anchors.centerIn: cardCountBackground
+        z: 2
+    }
 }

qml/images.qrc

@@ -67,6 +67,7 @@
     <file>../img/playing_cards/fronts/spades_jack.svg</file>
     <file>../img/playing_cards/fronts/spades_king.svg</file>
     <file>../img/playing_cards/fronts/spades_queen.svg</file>
+    <file>../img/flip_icon.svg</file>
   </qresource>
 </RCC>
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