Flutterコントリビューションのススメ

by Koji Wakamiya

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!'MVUUFS,BJHJ ,PKJ8BLBNJZB LPKJ 'MVUUFSίϯτϦϏϡʔγϣϯͷ εεϝ 1

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ࣗݾ঺հ w एٶߒ࢘ ,PKJ8BLBNJZB w ΞΧ΢ϯτ w !LPKJ (JU)VC w !LPKJ@ [FOO w !%@3@ 9 2

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͸͡Ίʹ 3

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͸͡Ίʹ ࿩ऀͷ'MVUUFSʹର๊͍͍ͯͯ͠Δҹ৅ w 'MVUUFSͷ඼࣭ʹ͸֓Ͷຬ଍ w ඳըύϑΥʔϚϯε΍ૢ࡞ײ͸े෼ͩͱײ͡Δ w .FUIPE$IBOOFMΛར༻͢Ε͹େ൒ͷ͜ͱ͕Ͱ͖Δ w 'MVUUFS։ൃνʔϜ΍'MVUUFSίϛϡχςΟʹର͢Δײँ͕େ͖͍ w 'MVUUFS͕Χόʔ͍ͯ͠Δൣғ͸ඇৗʹେ͖͍ w ଟ͘ͷ౒ྗͳ͠ʹ͸੒Γཱͨͳ͍ 4

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͸͡Ίʹ ࿩ऀͷ͖͔͚ͬ w $VSTPSEPFTOPUNPWFPOFOUFSJOHGVMMXJEUITQBDFJO5FYU'JFME w શ֯εϖʔεೖྗ࣌ɺΧʔιϧͷҐஔ͕શ֯εϖʔεͷઌʹҠಈ͠ͳ͍ෆ۩߹ 1 w ΧʔιϧҐஔΛߋ৽͢Δεϖʔεͱɺͦ͏Ͱ͸ͳ͍εϖʔεͷαϙʔτ͕࿙Ε͍ͯͨ w 5BC Y ͱ൒֯εϖʔε Y ͷΈ͕αϙʔτ͞Ε͍ͯͨ w WܥͰ1BSBHSBQIपΓͷ࣮૷͕ߋ৽͞Εͨ͜ͱ͕ىҼͩͬͨ 5

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͸͡Ίʹ ࿩ऀͷ͖͔͚ͬ w 6QEBUFIBT5SBJMJOH4QBDFT w શ֯εϖʔε Y ʹରԠ͢Δ13 w Wͷ४උ͕ਐΜͰ͍ͨͨΊɺWͰ͸ͳ͘WͰमਖ਼͕ϦϦʔε w ΍ΓͱΓʹࢀՃͯ͠ײ͍ͯͨ͜͡ͱ w ͲͷλΠϛϯάͰϦϦʔε͞ΕΔ͔͕ɺΠϚΠνʹೲಘͰ͖ͳ͔ͬͨ w 6OJDPEFΛௐ΂ͯΈΔͱɺ·ͩରԠ͕࿙Ε͍ͯΔέʔε͕͋Δ͜ͱʹؾ͍ͮͨ 6

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͸͡Ίʹ ࿩ऀͷ͖͔͚ͬ w 'JYDVSTPSQPTJUJPOXIFO6OJDPEF;TDBUFHPSZJTFOUFSFEJO5FYU'JFME w ະαϙʔτʹͳ͍ͬͯͨ6OJDPEF;TΧςΰϦʔʹଐ͢ΔશͯͷεϖʔεʹରԠ͢Δ13 w "4$**Ͱαϙʔτ͞Ε͍ͯΔશ֯εϖʔεͷΈͷαϙʔτ͸ෆ݈શͩͱײͨ͡ w ଟ͘ͷαϙʔτΛ͍͖ͨͩͳ͕Βɺ13͸ແࣄϚʔδ w ͔͠͠IPU fi Y͸͞ΕͣɺWͰϦϦʔε w ӨڹΛड͚͍ͯͨϢʔβʔ͸ɺWdWͷؒͰ໰୊͕ى͖͍ͯͨ͜ͱʹ 7

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͸͡Ίʹ ࿩ऀͷϞνϕʔγϣϯ w Ұ࿈ͷܦݧ͸৭ʑͱߟ͑Δ͖͔͚ͬʹͳͬͨ w 'MVUUFSͷຊ౰ͷϦεΫ͸ɺେڼͳ΋ͷͰ͸ͳ͘΋ͬͱ਎ۙͳ΋ͷͰ͸ʁ w ѱҙ͕͋ͬͯى͖͍ͯΔ͜ͱͰ͸ͳ͘ɺ७ਮʹ޻਺͕଍Γ͍ͯͳ͍ͷͰ͸ʁ w 'MVUUFS4%,ͷ։ൃऀͱར༻ऀͷؒʹɺେ͖ͳೝࣝͷ͕ࠩ͋ΔͷͰ͸ʁ w ೥൒΄Ͳܧଓͨ͠ίϯτϦϏϡʔγϣϯͷ஌ݟΛڞ༗͍ͨ͠ 8

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0QFOFEͱ$MPTFE 9

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0QFOFEͱ$MPTFE 'MVUUFS΁ͷظ଴ͱෆຬ w 'MVUUFSͷίϛϡχςΟͰΑ͘ݟ͔͚Δෆຬ w ػೳվળͷํ޲͕ٻΊ͍ͯΔ΋ͷͰ͸ͳ͍ w ػೳ։ൃΑΓ΋ෆ۩߹मਖ਼ͯ͠΄͍͠ w ͳͥ༏ઌ͢Δ΂͖ ͱߟ͑Δ΋ͷ ʹ͕ࠩੜ͡Δͷ͔ʁ w ࣮ࡍʹ࿩ऀ͕ରԠͨ͠13͔Βߟ͑ͯΈ͍ͨ 10

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0QFOFEͱ$MPTFE 'MVUUFS΁ͷظ଴ͱෆຬɿ։ൃܭըʹ༝དྷ͢ΔζϨ w .FEJB2VFSZBDDFTTJCMF/BWJHBUJPOJTOPUVQEBUJOHXIFOBZJTFOBCMFE w .FEJB2VFSZBDDFTTJCMF/BWJHBUJPO͕ߋ৽͞Εͯ΋ɺ6*ʹ൓ө͞Εͳ͍ෆ۩߹ w 'MVUUFS,BJHJͷηογϣϯͰ΋ݴٴ͞Εͨ*TTVF w 8FCͷωΠςΟϒʹ͍࣮ۙ૷ʹɺϑϥάͷ൓ө࿙Ε͕͋ͬͨ w 1Ͱىථ͞Ε͕ͨɺͷͪʹ1ʹมߋ͞Εͨ 11

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0QFOFEͱ$MPTFE 'MVUUFS΁ͷظ଴ͱෆຬɿ஍ҬʹΑΔζϨ w <8&#>+BQBOFTFQVODUVBUJPOBOESFBEJOHNBSLTBSFNJTQMBDFE w ௕͍೔ຊޠͷจষΛදࣔ͢Δͱɺ۟఺ͱಡ఺ͷҐஔ্͕Լதԝʹදࣔ͞ΕΔෆ۩߹ w 'BMMCBDL'POUͷಡΈࠐΈʹ͓͍ͯɺMBOHͰ൑ఆ͢ΔՕॴΛස౓Ͱ൑ఆ͍ͯͨ͠ w +1ͷ؀ڥͰ͋ͬͯ΋4$ͷ'POU͕ద༻͞Ε͍ͯͨ w 1ʹҐஔ෇͚ΒΕͨ w MBCFMBRVBMJUZͱ΋͞Ε͍ͯͨ 12

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0QFOFEͱ$MPTFE 'MVUUFS։ൃνʔϜͱΞϓϦ։ൃऀͷΰʔϧ w 'MVUUFS։ൃνʔϜʹͱͬͯ w 'MVUUFS͕੒ޭͨ͠ϑϨʔϜϫʔΫʹͳΔ͜ͱ w ΞϓϦ։ൃऀʹͱͬͯ w 'MVUUFSΛ࢖ͬͨΞϓϦ։ൃ͕੒ޭ͢Δ͜ͱ 13

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0QFOFEͱ$MPTFE ιʔείʔυͱҙࢥܾఆͷҧ͍ w 'MVUUFS͸ιʔείʔυ͕ΦʔϓϯͳɺΫϩʔζυͳϓϩδΣΫτ w ҙࢥܾఆͷաఔ΍ࠜڌʹ͍ͭͯɺར༻ऀ͸ਪଌ͢Δ͔͠ͳ͍ w զʑ͕ݟฉ͖͢Δ΋ͷ͸ɺ֎޲͚ʹൃද͞Εͨ΋ͷ͚ͩ w 0QFOFEͳ΋ͷͱ$MPTFEͳ΋ͷ w *TTVF΍13ɺ$PEFɺ%JTDPSE্ͷ΍ΓऔΓ͸Φʔϓϯ w ։ൃεέδϡʔϧ΍ϦϦʔε೔ɺʮ΍Δ΂͖͜ͱͷϦετʯ͸Ϋϩʔζ 14

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0QFOFEͱ$MPTFE 'MVUUFSͷ ιʔείʔυ 'MVUUFSͷ ํ਑΍༏ઌ౓ 15

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0QFOFEͱ$MPTFE લఏΛ౿·্͑ͨͰߦಈ͢Δ w ʰ'MVUUFSνʔϜͷߦಈΛม͑Δʱ͜ͱ͸໨ࢦ͞ͳ͍ํ͕ྑ͍ w ਖ਼͠͞Λࣔ͢͜ͱͰ͸ɺ໰୊͸ղফ͞Εͳ͍ w ʰίϯτϩʔϧՄೳͳม਺ʱʹಇ͖͔͚ͨํ͕ྑ͍ w ਖ਼͠͞Λࣔ͢ΑΓਖ਼͍͠ίʔυΛఏࣔ͢Δͷ͸؆୯ w ༏ઌ߲໨Λٞ࿦͢ΔΑΓࣗ෼Ͱղܾ͢Δํ͕ૣ͍ 16

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0QFOFEͱ$MPTFE ௚઀తͳΞϓϩʔνͷఏҊ w 0QFOͳྖҬ΁ͷੵۃతͳࢀՃΛਪ঑͍ͨ͠ w *TTVFͷ࡞੒΍ٞ࿦΁ͷࢀՃ w ༏ઌͯ͠ղফ͍ͨ͠*TTVFʹରԠ͢Δमਖ਼13Λఏग़ w 1΍1ϥϕϧͷ෇༩ঢ়گͷ؍ଌ w ௚઀తͳؔΘΓΛ࣋ͭϝϦοτ w ͋ͳͨΛऔΓר͘ϦεΫΛίϯτϩʔϧ͠΍͘͢ͳΔʂ 17

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௚઀తͳΞϓϩʔν ίϯτϩʔϧͱ͓فΓ w ࣗ෼͕ରԠ͢Δ͔ɺ୭͔͕ରԠ͢ΔͷΛفΔ͔ w 👍͸ຊ࣭తʹ͸໰୊Λղফ͠ͳ͍ w fl VUUFS fl VUUFSʹ͸طʹແ਺ͷ*TTVF͕͋Δ w ͋ͳͨʹͱͬͯԿ͕ॏཁͳͷ͔Ұ൪஌͍ͬͯΔͷ͸͋ͳͨ 18

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௚઀తͳΞϓϩʔν ίϯτϩʔϧͰ͖ΔϦεΫ 'MVUUFSͷlίʔυzʹؔ͢Δ΋ͷ w 'MVUUFS4%,ʹཉ͍͠8JEHFU͕ଘࡏ͠ͳ͍ϦεΫ w 'MVUUFS4%,ʹط஌ͷෆ۩߹͕ଘࡏ͢ΔϦεΫ w ϫʔΫΞϥ΢ϯυͷௐࠪ΍ղফ w 'MVUUFS4%,ͷෆ۩߹͕ΞϓϦʹӨڹ͢ΔϦεΫ w ΞϓϦͷݕূʹΑΔൃݟͱճආ 19

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௚઀తͳΞϓϩʔν ίϯτϩʔϧͰ͖ͳ͍ϦεΫ 'MVUUFSͷl։ൃzʹؔ͢Δ΋ͷ w 'MVUUFSͷ։ൃ͕தஅ͞ΕΔϦεΫ w ଏʹ͍͏l,JMMFECZ(PPHMFzϦετʹೖΔ͔Ͳ͏͔ w 'MVUUFSͷ։ൃίΞϝϯόʔ͕ҟಈɾ཭୤͢ΔϦεΫ w 'MVUUFSͷϦϦʔελΠϛϯάΛࣄલʹ೺ѲͰ͖ͳ͍ϦεΫ 20

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௚઀తͳΞϓϩʔν ϦεΫΛίϯτϩʔϧ͢Δ w ୭͔͕खΛಈ͔͢͜ͱͰɺଟ͘ͷ͜ͱ͕໌Β͔ʹͳΔ w ͳͥ໰୊͕ى͖͍ͯΔͷ͔ w मਖ਼͕ͲΕ΄Ͳ೉͍͠ͷ͔ w ղফ͞ΕΔͷ͸͍ͭʹͳΔͷ͔ w ޾͍ͳ͜ͱʹɺ'MVUUFSͷίʔυ͸ެ։͞Ε͍ͯΔ w fl VUUFS fl VUUFSϦϙδτϦͷ͸%BSUͰॻ͔Ε͍ͯΔʂ 21

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ίϯτϦϏϡʔγϣϯͷεεϝ 22

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ίϯτϦϏϡʔγϣϯͷεεϝ ஫ҙ͠ͳ͚Ε͹ͳΒͳ͍͜ͱʢࣗռ΋ࠐΊͯʣ w ͢΂ͯͷϓϩηεΛָ͠Ή w ։ൃͷෛ୲ɺλΠϜκʔϯͷҧ͍ͳͲ༷ʑͳো֐͕͋Δ w ඇৗʹ೉͍͠໰୊Ͱɺ਺೔೰·͞ΕΔ͜ͱ΋͋Δ w Ͱ΋ɺࢥ͏ଘ෼Ձ஋ͷ͋ΔίʔυΛॻ͘ͷ͸ָ͍͠ w ޷͖ͳΑ͏ʹऔΓ૊ΜͰɺ޷͖ͳΑ͏ʹఘΊͯྑ͍ w ࿩ऀ͸ϩʔϦεΫͰϋΠϦλʔϯͳझຯͩͱࢥ͍ͬͯΔ 23

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ίϯτϦϏϡʔγϣϯͷεεϝ ஫ҙ͠ͳ͚Ε͹ͳΒͳ͍͜ͱʢࣗռ΋ࠐΊͯʣ w ໰୊Λపఈతʹཧղ্ͨ͠ͰɺղܾҊΛఏҊ͢Δ͜ͱ w ʮͳͥ͜ͷमਖ਼͕ద੾ͳͷ͔ʯΛઆ໌Ͱ͖Δঢ়ଶͰ͋Δ͜ͱ w "*ͷαϙʔτ͸͋ͬͯ΋ྑ͍͕ɺ"*ͳ͠Ͱઆ໌Ͱ͖Δঢ়ଶͰ͋Δ͜ͱ w मਖ਼ίʔυͱରԠ͢ΔςετίʔυΛηοτͰ༻ҙ͢Δ͜ͱ w ʮͳͥ͜ͷमਖ਼ͳͷ͔ʯΛ࠷΋ڧ͘Ξϐʔϧ͢Δͷ͸ςετίʔυ w ෆ۩߹ͷݪҼղੳΑΓ΋ɺςετίʔυ࡞੒ͷํ͕͕͔͔࣌ؒΓ͕ͪ 24

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ίϯτϦϏϡʔγϣϯͷεεϝ ͭͷϝϦοτ ໰୊͕ղফ͞ΕΔ ஌ࣝɾٕೳ͕਎ʹͭ͘ ܦݧ஋͕૿͑Δ 25

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ίϯτϦϏϡʔγϣϯͷεεϝ ໰୊͕ղফ͞ΕΔ w 'MVUUFSͷ໰୊ɺ΋͘͠͸໰୊ʹΑΓҾ͖ى͜͞Ε͍ͯͨࣄ৅͕ղফ͞ΕΔ w ࠷΋௚઀తͳϝϦοτ w ϦϦʔεϒϩοΧʔ΍ػೳ੍ݶͷݪҼΛղফͰ͖Ε͹ɺΞϓϦʹͱͬͯͷՁ஋͕ߴ͍ w 'MVUUFS4%,ʹ͋Δόά͸ɺϢʔβʔ͔Β͸ΞϓϦͷόάʹݟ͑Δ w 'MVUUFS4%,ͷόά͕ͭ௚Δͱɺ͋ͳͨͷΞϓϦ͔Β΋όά͕ͭ௚Δ͜ͱʹͳΔ 26

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ίϯτϦϏϡʔγϣϯͷεεϝ ஌ࣝɾٕೳ͕਎ʹͭ͘ w ͳͥ໰୊͕ى͖ͨͷ͔ͱͲ͏໰୊Λճආ͢Δͷ͔ w *TTVFͷղফʹࢸΒͳ͘ͱ΋ɺऔΓ૊Ή͜ͱͰಘΒΕΔ஌ࣝ͸ଟ͍ w ղফ͕ݟࠐΊͳ͍ɺͱ͍͏͜ͱ͕Θ͔Δ͜ͱ΋͋Δ w ୭ʹ΋ղফͰ͖ͳ͍ͱΘ͔Ε͹ɺ࿑ྗΛׂ͘ඞཁ΋ͳ͘ͳΔ w ݪҼ͕Θ͔Βͣͱ΋ɺճආࡦ͕Θ͔Δ͜ͱ΋͋Δ w *TTVFʹऔΓ૊Ήͱɺ͔ͦ͜Β޿͕Δ஌ࣝ΍ܦݧ͕ಘΒΕΔ 27

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ίϯτϦϏϡʔγϣϯͷεεϝ ܦݧ஋͕૿͑Δ w طଘίʔυ͔Βෆ۩߹Λղੳ͠ݕ౼͢Δܦݧ஋ w ແ਺ͷෆ۩߹Λղੳ͢Δܦݧ͸ͳ͔ͳ͔ੵΊͳ͍ w ୭͔Β΋Ͳ͔͜ΒͰ΋ࢀরՄೳͳܦݧ஋ w ղফͨ͠*TTVF΍ఏग़ͨ͠13 w ڊେͳίʔυϕʔεʹରቂͰ͖Δ࣮੷ w 'MVUUFS4%,΁ͷऔΓ૊Έ͕ɺ༷ʑͳ଍ֻ͔Γʹͳ͍ͬͯ͘ 28

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8IZOPUUIFCFTU 29

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8IZOPUUIFCFTU ηογϣϯͷ·ͱΊ w 'MVUUFS4%,ͷ՝୊΍ෆ۩߹͸ɺ͋ͳͨͷΞϓϦͷ՝୊΍ෆ۩߹ʹͳ͍ͬͯΔ w ௐࠪ͠ɺճආͨ͠Γղফͨ͠Γ͢Δखஈ͕͋Δ w ՝୊΍ෆ۩߹ʹऔΓ૊Ή͜ͱͰɺ֫ಘ͞ΕΔٕೳ΍ධՁ͕͋Δ 30

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8IZOPUUIFCFTU ηογϣϯͷ·ͱΊ w 'MVUUFS4%,ΛऔΓר͘ίϛϡχςΟ͸ଟ༷Ͱ͋Δ΂͖ w 'MVUUFSΛར༻ͨ͠ΞϓϦ͸ɺඇৗʹଟ༷ͳϢʔβʔΛ͍࣋ͬͯΔ w ։ൃίϛϡχςΟʹภΓ͕͋Δ͜ͱ͸ɺ͋·Γྑ͍͜ͱͰ͸ͳ͍ 31

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8IZOPUUIFCFTU ηογϣϯͷ·ͱΊ w ͋ͳ͕ͨؔΘΔ͜ͱͰɺ'MVUUFSͷ։ൃ͸̍ͭલਐ͠·͢ 32

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8IZOPUUIFCFTU ΍Δؾʹຬͪͨ͋ͳͨ΁ w ·ͣ͸(JU)VCͷ*TTVFΛνΣοΫ w MBCFM1΍MBCFMIBTSFQSPEVDJCMFTUFQTͰݕࡧ͢Δͷ͕͓͢͢Ί w MBCFMGNBUFSJBMEFTJHO΍MBCFMQMBUGPSNXFCͳͲͰڵຯ͕͋ΔՕॴΛߜΓࠐΉ 33

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5IBOLT 34