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Squaby Demo

 import QtQuick 2.0

 //Image {
 Item {
     id: upgradeWeapon
     // can be range or shootDelay or repair
     property string upgradeType: ""

     // this lets the outside component set the cost of this upgrade or tower
     property alias cost:costTag.cost

     // affordable should change with the player gold - if the player has more gold than the tower costs, it is affordable; if non-affordable, opacity will be set to 0.5
     // it is set to true explicitly for the sell button!
     property bool affordable: player.gold>=cost
     opacity: affordable && !fullyUpgraded ? 1 : 0.5

     property bool fullyUpgraded: false
     property int upgradeLevel: 0
     property string selectedTowerId: "undefined"
     property string selectedTowerType: "undefined"

     property string source

     // this can be handled by the hud, especially for the sell button to change the upgradeState of the hud back to the buy state
     signal clicked

     // is needed, otherwise anchoring the UpgradeWeapon-Buttons in a Row wouldnt work!
     width: upgradeWeaponSprite.width
     height: upgradeWeaponSprite.height

     function setUpgradeButtonFromEvent(event) {

         var rangeUpgrade;
         var shootDelayUpgrade;
         var activeUpgrade;
         for(var i=0;i<event.upgrades.length;i++) {
             var upgrade = event.upgrades[i];
             if(upgrade.type === "range")
                 rangeUpgrade = upgrade;
             else if(upgrade.type === "shootDelay" || upgrade.type === "damagePerSecond")
                 shootDelayUpgrade = upgrade;

             if(upgrade.type === upgradeType)
                 activeUpgrade = upgrade;
         }

         if(!activeUpgrade || !rangeUpgrade || !shootDelayUpgrade) {
             console.log("WARNING: one of the necessary upgrades range or shootDelay not found, this should never happen!");
             console.log("UpgradeWeapon: activeUpgrade: " + activeUpgrade + ", rangeUpgrade: " + rangeUpgrade + ", shootDelayUpgrade: " + shootDelayUpgrade + ", upgradeType of QML object: " + upgradeType);
             return;
         }
         console.log("UpgradeWeapon: active upgrade is " + activeUpgrade.type);

         cost = activeUpgrade.cost;

         selectedTowerId = event.entityId;
         selectedTowerType = event.entityType;

         // fullyUpgraded modification is not only useful for range and shootDelay upgrade
         // also with the repair upgrade can be determined if the repair upgrade was used (then it should not be available)
         if(activeUpgrade.upgradeLevel === activeUpgrade.currentPlayerUpgradeLevel) {
             console.debug("UpgradeWeapon: upgrade of type " + upgradeType + " is fully upgraded");
             fullyUpgraded = true;
         } else {
             console.debug("UpgradeWeapon: upgrade of type " + upgradeType + " is not fully upgraded");
             fullyUpgraded = false;
         }

         console.log("UpgradeWeapon: activeUpgrade.currentPlayerUpgradeLevel: " + activeUpgrade.currentPlayerUpgradeLevel + ", activeUpgrade.upgradeLevel: " + activeUpgrade.upgradeLevel + ", selectedTowerType: " + selectedTowerType);

         if(activeUpgrade.type === "range") {
             if(activeUpgrade.upgradeLevel === 1)
                 if(selectedTowerType === "nailgun")
                     source = "nailgunUpgradeRange.png";
                 else if(selectedTowerType === "flamethrower")
                     source = "flamethrowerUpgradeRange.png";
                 else if(selectedTowerType === "taser")
                     source = "taserUpgradeRange.png";
                 else if(selectedTowerType === "tesla")
                     source = "teslaUpgradeRange.png";
                 else if(selectedTowerType === "turbine")
                     source = "turbineUpgradeRange.png"
             // if other upgrade is at level 1 and this upgrade is not fully built, this image needs to be replaced with full upgrade one
             if(shootDelayUpgrade.currentPlayerUpgradeLevel === 1 && !fullyUpgraded)
                 if(selectedTowerType === "nailgun")
                     source = "nailgunUpgradeBoth.png";
                 else if(selectedTowerType === "flamethrower")
                     source = "flamethrowerUpgradeBoth.png";
                 else if(selectedTowerType === "taser")
                     source = "taserUpgradeBoth.png";
                 else if(selectedTowerType === "tesla")
                     source = "teslaUpgradeBoth.png";
                 else if(selectedTowerType === "turbine")
                     source = "turbineUpgradeBoth.png"
         } else if(activeUpgrade.type === "shootDelay" || activeUpgrade.type === "damagePerSecond" ) {
             // use the same images for shootDelayUpgrade (nailgun & turbine) and damagePerSecond (flamethrower)
             if(upgrade.upgradeLevel === 1)
                 if(selectedTowerType === "nailgun")
                     source = "nailgunUpgradeFire.png";
                 else if(selectedTowerType === "flamethrower")
                     source = "flamethrowerUpgradeFire.png";
                 else if(selectedTowerType === "taser")
                     source = "taserUpgradeFire.png";
                 else if(selectedTowerType === "tesla")
                     source = "teslaUpgradeFire.png";
                 else if(selectedTowerType === "turbine")
                     source = "turbineUpgradeFire.png"
             // if other upgrade is at level 1 and this upgrade is not fully built, this image needs to be replaced with full upgrade one
             if(rangeUpgrade.currentPlayerUpgradeLevel === 1 && !fullyUpgraded)
                 if(selectedTowerType === "nailgun")
                     source = "nailgunUpgradeBoth.png";
                 else if(selectedTowerType === "flamethrower")
                     source = "flamethrowerUpgradeBoth.png";
                 else if(selectedTowerType === "taser")
                     source = "taserUpgradeBoth.png";
                 else if(selectedTowerType === "tesla")
                     source = "teslaUpgradeBoth.png";
                 else if(selectedTowerType === "turbine")
                     source = "turbineUpgradeBoth.png"
         }

         console.log("UpgradeWeapon: selected source: " + source);

     }

     SingleSquabySprite {
         id: upgradeWeaponSprite
         // the source gets set in setUpgradeButtonFromEvent()
         // add initial sprite so the sprite sheet has the correct size when changing the source.
         source: upgradeWeapon.source !== "" ? Qt.resolvedUrl("../../../assets/img/menu_labels/" + upgradeWeapon.source) : upgradeWeapon.source
     }

     PriceTag {
         id: costTag
         anchors.right: parent.right
         anchors.bottom: parent.bottom
     }

     MouseArea {
         anchors.fill: parent

         onClicked: {
             // this isnt needed - the function upgradeTower() can be called directly on the tower!
 //            var guiEvent = {
 //                eventType: "upgrade_selected",
 //                towerId: selectedTowerId,
 //                upgradeType: upgradeWeapon.upgradeType
 //            }
             //engine.createGuiEvent(guiEvent);

             // check if the player has enough money, and this upgrade is not fully used
             // this gets also checked in upgradeTower() though, but it can be checked here already to avoid checking again in upgradeTower()
             if(affordable && !fullyUpgraded) {
                 var selectedTower = entityManager.getEntityById(selectedTowerId);

                 if(!selectedTower) {
                     console.debug("UpgradeWeapon: WARNING: the tower with id '", selectedTowerId, "' was not found in the entity array! no upgrade possible!")
                     return;
                 }

                 if(!tutorials.nextAction("upgradeButton",upgradeType))
                   return

                 selectedTower.upgradeTower(upgradeType);

                 // decrease the player gold by the cost of this upgrade
                 // this is done in TowerBase!
                 //player.gold -= cost;

                 // emit the clicked signal only when the operation is available successful! the clicked signal gets used in the HUD to play the sound effects
                 upgradeWeapon.clicked();
             }