mobile/cleanup: fix cylinder visibility in dive edit

And wow isn't that a nice improvement in the code.

Also has the benefit of actually doing the right thing and not creating
unwanted white space for missing cylinders. And does away with all these
warnings about coercion (after all, we were checking against the wrong
value.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

mobile-widgets/qml/DiveDetailsEdit.qml

@@ -84,31 +84,31 @@ Item {
 		var state =  diveDetailsPage.state
 		diveDetailsPage.state = "view" // run the transition
 		// join cylinder info from separate string into a list.
-		if (usedCyl[0] != null) {
+		if (usedCyl[0] !== undefined) {
 			usedCyl[0] = cylinderBox0.currentText
 			usedGas[0] = txtGasMix0.text
 			startpressure[0] = txtStartPressure0.text
 			endpressure[0] = txtEndPressure0.text
 		}
-		if (usedCyl[1] != null) {
+		if (usedCyl[1] !== undefined) {
 			usedCyl[1] = cylinderBox1.currentText
 			usedGas[1] = txtGasMix1.text
 			startpressure[1] = txtStartPressure1.text
 			endpressure[1] = txtEndPressure1.text
 		}
-		if (usedCyl[2] != null) {
+		if (usedCyl[2] !== undefined) {
 			usedCyl[2] = cylinderBox2.currentText
 			usedGas[2] = txtGasMix2.text
 			startpressure[2] = txtStartPressure2.text
 			endpressure[2] = txtEndPressure2.text
 		}
-		if (usedCyl[3] != null) {
+		if (usedCyl[3] !== undefined) {
 			usedCyl[3] = cylinderBox3.currentText
 			usedGas[3] = txtGasMix3.text
 			startpressure[3] = txtStartPressure3.text
 			endpressure[3] = txtEndPressure3.text
 		}
-		if (usedCyl[4] != null) {
+		if (usedCyl[4] !== undefined) {
 			usedCyl[4] = cylinderBox4.currentText
 			usedGas[4] = txtGasMix4.text
 			startpressure[4] = txtStartPressure4.text
@@ -352,12 +352,9 @@ Item {
 			// first cylinder
 			Flow {
 				width: parent.width
-
-
 				RowLayout {
 					width: Kirigami.Units.gridUnit * 12
 					id: cb1
-
 					TemplateLabelSmall {
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
 						horizontalAlignment: Text.AlignRight
@@ -382,7 +379,7 @@ Item {
 					}
 					SsrfTextField {
 						id: txtGasMix0
-						text: usedGas[0] != null ? usedGas[0] : null
+						text: usedGas[0] !== undefined ? usedGas[0] : null
 						Layout.fillWidth: true
 						validator: RegExpValidator { regExp: /(EAN100|EAN\d\d|AIR|100|\d{1,2}|\d{1,2}\/\d{1,2})/i }
 						flickable: detailsEditFlickable
@@ -398,7 +395,7 @@ Item {
 					}
 					SsrfTextField {
 						id: txtStartPressure0
-						text: startpressure[0] != null ? startpressure[0] : null
+						text: startpressure[0] !== undefined ? startpressure[0] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -413,7 +410,7 @@ Item {
 					}
 					SsrfTextField {
 						id: txtEndPressure0
-						text: endpressure[0] != null ? endpressure[0] : null
+						text: endpressure[0] !== undefined ? endpressure[0] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -422,18 +419,16 @@ Item {
 			//second cylinder
 			Flow {
 				width: parent.width
-
+				visible: usedCyl[1] !== undefined ? true : false
 				RowLayout {
 					id: cb2
 					width: Kirigami.Units.gridUnit * 12
 					TemplateLabelSmall {
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
-						visible: usedCyl[1] != null ? true : false
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Cylinder2:")
 					}
 					TemplateComboBox {
-						visible: usedCyl[1] != null ? true : false
 						id: cylinderBox1
 						flickable: detailsEditFlickable
 						flat: true
@@ -446,15 +441,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 8
 					height: cb2.height
 					TemplateLabelSmall {
-						visible: usedCyl[1] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Gas mix:")
 					}
 					SsrfTextField {
-						visible: usedCyl[1] != null ? true : false
 						id: txtGasMix1
-						text: usedGas[1] != null ? usedGas[1] : null
+						text: usedGas[1] !== undefined ? usedGas[1] : null
 						Layout.fillWidth: true
 						validator: RegExpValidator { regExp: /(EAN100|EAN\d\d|AIR|100|\d{1,2}|\d{1,2}\/\d{1,2})/i }
 						flickable: detailsEditFlickable
@@ -464,15 +457,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb2.height
 					TemplateLabelSmall {
-						visible: usedCyl[1] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Start Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[1] != null ? true : false
 						id: txtStartPressure1
-						text: startpressure[1] != null ? startpressure[1] : null
+						text: startpressure[1] !== undefined ? startpressure[1] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -481,15 +472,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb2.height
 					TemplateLabelSmall {
-						visible: usedCyl[1] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("End Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[1] != null ? true : false
 						id: txtEndPressure1
-						text: endpressure[1] != null ? endpressure[1] : null
+						text: endpressure[1] !== undefined ? endpressure[1] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -498,17 +487,16 @@ Item {
 			// third cylinder
 			Flow {
 				width: parent.width
+				visible: usedCyl[2] !== undefined ? true : false
 				RowLayout {
 					id: cb3
 					width: Kirigami.Units.gridUnit * 12
 					TemplateLabelSmall {
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
-						visible: usedCyl[2] != null ? true : false
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Cylinder3:")
 					}
 					TemplateComboBox {
-						visible: usedCyl[2] != null ? true : false
 						id: cylinderBox2
 						flickable: detailsEditFlickable
 						currentIndex: find(usedCyl[2])
@@ -522,15 +510,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 8
 					height: cb3.height
 					TemplateLabelSmall {
-						visible: usedCyl[2] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Gas mix:")
 					}
 					SsrfTextField {
-						visible: usedCyl[2] != null ? true : false
 						id: txtGasMix2
-						text: usedGas[2] != null ? usedGas[2] : null
+						text: usedGas[2] !== undefined ? usedGas[2] : null
 						Layout.fillWidth: true
 						validator: RegExpValidator { regExp: /(EAN100|EAN\d\d|AIR|100|\d{1,2}|\d{1,2}\/\d{1,2})/i }
 						flickable: detailsEditFlickable
@@ -540,15 +526,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb3.height
 					TemplateLabelSmall {
-						visible: usedCyl[2] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Start Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[2] != null ? true : false
 						id: txtStartPressure2
-						text: startpressure[2] != null ? startpressure[2] : null
+						text: startpressure[2] !== undefined ? startpressure[2] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -557,15 +541,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb3.height
 					TemplateLabelSmall {
-						visible: usedCyl[2] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("End Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[2] != null ? true : false
 						id: txtEndPressure2
-						text: endpressure[2] != null ? endpressure[2] : null
+						text: endpressure[2] !== undefined ? endpressure[2] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -574,17 +556,16 @@ Item {
 			// fourth cylinder
 			Flow {
 				width: parent.width
+				visible: usedCyl[3] !== undefined ? true : false
 				RowLayout {
 					id: cb4
 					width: Kirigami.Units.gridUnit * 12
 					TemplateLabelSmall {
-						visible: usedCyl[3] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Cylinder4:")
 					}
 					TemplateComboBox {
-						visible: usedCyl[3] != null ? true : false
 						id: cylinderBox3
 						flickable: detailsEditFlickable
 						currentIndex: find(usedCyl[3])
@@ -599,15 +580,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 8
 					height: cb4.height
 					TemplateLabelSmall {
-						visible: usedCyl[3] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Gas mix:")
 					}
 					SsrfTextField {
-						visible: usedCyl[3] != null ? true : false
 						id: txtGasMix3
-						text: usedGas[3] != null ? usedGas[3] : null
+						text: usedGas[3] !== undefined ? usedGas[3] : null
 						Layout.fillWidth: true
 						validator: RegExpValidator { regExp: /(EAN100|EAN\d\d|AIR|100|\d{1,2}|\d{1,2}\/\d{1,2})/i }
 						flickable: detailsEditFlickable
@@ -618,15 +597,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb4.height
 					TemplateLabelSmall {
-						visible: usedCyl[3] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Start Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[3] != null ? true : false
 						id: txtStartPressure3
-						text: startpressure[3] != null ? startpressure[3] : null
+						text: startpressure[3] !== undefined ? startpressure[3] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -636,15 +613,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb4.height
 					TemplateLabelSmall {
-						visible: usedCyl[3] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("End Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[3] != null ? true : false
 						id: txtEndPressure3
-						text: endpressure[3] != null ? endpressure[3] : null
+						text: endpressure[3] !== undefined ? endpressure[3] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -653,17 +628,16 @@ Item {
 			// fifth cylinder
 			Flow {
 				width: parent.width
+				visible: usedCyl[4] !== undefined ? true : false
 				RowLayout {
 					id: cb5
 					width: Kirigami.Units.gridUnit * 12
 					TemplateLabelSmall {
-						visible: usedCyl[4] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Cylinder5:")
 					}
 					TemplateComboBox {
-						visible: usedCyl[4] != null ? true : false
 						id: cylinderBox4
 						flickable: detailsEditFlickable
 						currentIndex: find(usedCyl[4])
@@ -679,15 +653,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 8
 					height: cb5.height
 					TemplateLabelSmall {
-						visible: usedCyl[4] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 4
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Gas mix:")
 					}
 					SsrfTextField {
-						visible: usedCyl[4] != null ? true : false
 						id: txtGasMix4
-						text: usedGas[4] != null ? usedGas[4] : null
+						text: usedGas[4] !== undefined ? usedGas[4] : null
 						Layout.fillWidth: true
 						validator: RegExpValidator { regExp: /(EAN100|EAN\d\d|AIR|100|\d{1,2}|\d{1,2}\/\d{1,2})/i }
 						flickable: detailsEditFlickable
@@ -698,15 +670,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb5.height
 					TemplateLabelSmall {
-						visible: usedCyl[4] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("Start Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[4] != null ? true : false
 						id: txtStartPressure4
-						text: startpressure[4] != null ? startpressure[4] : null
+						text: startpressure[4] !== undefined ? startpressure[4] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}
@@ -716,15 +686,13 @@ Item {
 					width: Kirigami.Units.gridUnit * 10
 					height: cb5.height
 					TemplateLabelSmall {
-						visible: usedCyl[4] != null ? true : false
 						Layout.preferredWidth: Kirigami.Units.gridUnit * 6
 						horizontalAlignment: Text.AlignRight
 						text: qsTr("End Pressure:")
 					}
 					SsrfTextField {
-						visible: usedCyl[4] != null ? true : false
 						id: txtEndPressure4
-						text: endpressure[4] != null ? endpressure[4] : null
+						text: endpressure[4] !== undefined ? endpressure[4] : null
 						Layout.fillWidth: true
 						flickable: detailsEditFlickable
 					}