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地図のUIで MultiChildRenderObject を自作するハメになった話
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づだ
July 02, 2025
Technology
1
44
地図のUIで MultiChildRenderObject を自作するハメになった話
Flutter Tokyo #9 の登壇内容
https://flutter-jp.connpass.com/event/359088/
づだ
July 02, 2025
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Transcript
ాେ!;VEBI ਤͷ6*Ͱ .VMUJ$IJME3FOEFS0CKFDUΛࣗ࡞͢ Δϋϝʹͳͬͨ
ࣗݾհ ͮͩ w 'MVUUFS͔ΒΤϯδχΞʹͳͬͨਓʢ͘Β͍ʣ w ࠷ۙϑϦʔϥϯεʹͳͬͨਓ ࠷ۙͷϚΠϒʔϜ ػಈઓ࢜(VOEBN(2VVVVVV9ʗΫΨల͍ͬͨʗϞϯϋϯϫΠ ϧζͷྺઓηϧϨΪΦεָ͍͠ʗϑΝΠΞʔΤϜϒϨϜΤϯήʔδ ʗʹ͔ͷʗ4XJUDIམબʗϙέϞϯͷΞχϝ໘ന͍ʗΨϯμ
ాେ!;VEBI ਤͷ6*Ͱ .VMUJ$IJME3FOEFS0CKFDUΛࣗ࡞͢ Δϋϝʹͳͬͨ
fl VUUFS@NBQύοέʔδ w ϚʔΧʔΛ8JEHFUͰදࣔͰ͖Δ
໘ͨ͠՝ w ϚʔΧʔ͕ॏͳͬͯݟͮΒ͍
՝ w (PPHMF.BQΈ͍ͨʹ͍ͨ͠
ཧ ϚʔΧʔ͕ॏͳ͍ͬͯΔͱɺখؙ͍͞ʹ͢Δ খؙ͍͞ͰॏͳΔ߹ɺඇදࣔʹ͢Δ খؙ͍͞ಉ࢜ɺॏͳ͍͍ͬͯ ϚʔΧʔΛɺݻఆαΠζͰѻ͍ͨ͘ͳ͍
w ݻఆαΠζʢUJHIUͳ੍ʣͰͳ͘ɺΟδΣοτΒ͍͠ॊೈͳαΠζ ʢMPPTFͳ੍ʣͰௐ͍ͨ͠ w ςΩετͷ͞ʹΑͬͯɺϚʔΧʔͷαΠζมΘΔ w ը૾ͷΞεϖΫτൺʹґଘͰ͖ͨΓͰ͖Δ ݻఆαΠζͰѻ͍ͨ͘ͳ͍
3FOEFS0CKFDU ࣗ࡞͠ͳ͍ํ͕͍͍
3FOEFS0CKFDUࣗ࡞ͷσϝϦοτ ɾϛϡʔλϒϧͳΛѻ͏ͷͰɺએݴతͰͳ͍ ɹˠ·ͣɺطଘͷΟδΣοτͰରԠ͢Δํ๏Λࡧ͢Δ͖ͱ அɻ
ϘπҊᶃ(MPCBM,FZܦ༝ͰαΠζऔಘ ɾඳըޙʹ(MPCBM,FZDVSSFOU$POUFYUTJ[FΛ࣮ߦ͢Δ͜ͱͰɺαΠ ζΛऔಘͰ͖Δ ɾ4J[F$IBOHFE-BZPVU/PUJ fi FSΟδΣοτΛ͑ɺαΠζมߋΛ ௨Ͱ͖Δ
None
None
ϘπҊᶃ(MPCBM,FZܦ༝ͰαΠζऔಘ ɾ࠷ॳͷ̍ϑϨʔϜɺԿදࣔ͞Εͳ͍ঢ়ଶʹͳΔ ɾ͔ͳΓίʔυ͕ෳࡶʹͳΔ͜ͱ͕༧͞ΕΔ ˠͰ͖ͳ͘ͳͦ͞͏͚ͩͲɺඍົͳΟδΣοτʹͳΓͦ͏
ϘπҊᶄ $VTUPN.VMUJ$IJME-BZPVU w .VMUJ$IJME-BZPVU%FMFHBUFͱ ͍͏ಠࣗΫϥεͰɺෳࡶͳ DIJMESFOදࣔʹରԠ IUUQTBQJ fl VUUFSEFW fl
VUUFSXJEHFUT$VTUPN.VMUJ$IJME-BZPVUDMBTTIUNM
None
ϘπҊᶄ$VTUPN.VMUJ$IJME-BZPVU w 0 ff TFUௐ͕͜ͷΟδΣοτͷ伴ͳͷͰɺʮඇදࣔʯͷཁ݅ʹ ରԠ͍ͯ͠ͳ͍ w ඳըͯ͠αΠζऔಘˠ0 ff TFUௐͷॱ൪͕ݻఆɺڧ੍͞Ε͍ͯΔ
w αΠζऔಘͨ࣌͠Ͱɺඳը͕֬ఆͯ͠͠·͏
3FOEFS0CKFDUΛ ࣗ࡞ͨ͠ํ͕͍͍
None
ᶃͱΓ͋͑ͣɺ3FOEFS4UBDLͷதΛύΫΔ
ᶄඞཁͳؔΛPWFSSJEF w QFSGPSN-BZPVU ˠαΠζ w QBJOU ɹɹɹɹɹˠඳը w IJU5FTU$IJMESFO ˠλοϓྖҬ
ઓུɿ QFSGPSN-BZPVU ͰαΠζऔಘɺॏͳΓఆΛߦ͍ɺQBJOU Ͱදࣔ Γସ͑Λߦ͏
ᶅQFSGPSN-BZPVU @0WFSMBQ5ZQFͷఆٛ
ᶅQFSGPSN-BZPVU DIJMEͷ܁Γฦ͠Λهड़
ᶅQFSGPSN-BZPVU DIJMEͷQBSFOU%BUBʹॏͳΓ݁ՌΛอ࣋ͤ͞Δ
ᶅQFSGPSN-BZPVU DIJMEͷQBSFOU%BUBʹॏͳΓ݁ՌΛอ࣋ͤ͞Δ
ᶆQBJOU ֤@0WFSMBQ5ZQF͝ͱʹɺQBJOUΛ࣮ߦ
ͬ͘͟Γ·ͱΊ w ͱΓ͋͑ͣ3FOEFS4UBDLΛίϐΔ w αΠζҐஔௐ෦ͷΧελϚΠζɺQFSGPSN-BZPVU Λ͍͡ Δ w QFSGPSN-BZPVU ͱQBJOU
ͰΓऔΓΛ͍ͤͨ͞߹ɺ DIJMEQBSFOU%BUBʹมΛอ࣋ͤ͞Δ
3FOEFS0CKFDUͷࣗ࡞ سආ͗͢͠ͳ͍ํ͕͍͍
IUUQTBQJ fl VUUFSEFW fl VUUFSSFOEFSJOH.VMUJ$IJME-BZPVU%FMFHBUFDMBTTIUNM *GZPVXBOUUPCVJMEBDVTUPNMBZPVUXIFSFZPVEF fi OFUIFTJ[FPGUIBU XJEHFUCBTFEPOJUTDIJMESFO UIFOZPVXJMMIBWFUPDSFBUFBDVTUPN
SFOEFSPCKFDU4FF.VMUJ$IJME3FOEFS0CKFDU8JEHFUXJUI $POUBJOFS3FOEFS0CKFDU.JYJOBOE3FOEFS#PY$POUBJOFS%FGBVMUT.JYJOUP HFUTUBSUFEPS3FOEFS4UBDLGPSBOFYBNQMFJNQMFNFOUBUJPO
ࠓͯ͠ͳ͍͜ͱ ͘͠ɺ·ͩղܾͰ͖ͯͳ͍͜ͱ w λοϓྖҬ w ϑΣʔυΠϯɾϑΣʔυΞτͷΞχϝʔγϣϯͷ༩ w QFSGPSN-BZPVU લʹɺͦͦDIJMESFOͷΛݮΒͯ͠ύϑΥʔϚϯε վળ
·ͱΊ w (MPCBM,FZͰαΠζऔಘ͢Δํ๏ɺ͍࣮͜͠ʹͳΓ͕ͪͳͷͰɺՄೳ Ͱ͋Εճආ͢Δ w $VTUPN.VMUJ$IJME-BZPVUɺ͋͘·ͰϙδγϣϯΛΧελϚΠζ͢ΔͨΊͷ ͷͰɺʮ݅ʹΑͬͯඇදࣔʯରԠͮ͠Β͍ w .VMUJ$IJME3FOEFS0CKFDUΛࣗ࡞͢Δ߹ɺ3FOEFS4UBDLΛίϐϖͯ͠த ͍͡Δͷ͕ۙಓ
w $POUBJOFS3FOEFS0CKFDU.JYJO3FOEFS#PY$POUBJOFS%FGBVMUT.JYJO 1BSFOU%BUBͷཧղɺॻ͖ͳ͕Β͍ͯ͘͠